diff --git a/xerbia.adb b/xerbia.adb
index b85b88d..d95032b 100644
--- a/xerbia.adb
+++ b/xerbia.adb
@@ -22,7 +22,7 @@ procedure xerbia is
 
                                              ------------------------------------------------------------------------------------------
 
-	subtype random_integer_range is integer range 0 .. 1024;
+	subtype random_integer_range is integer range -1024 .. 1024;
 
 	package random_integer_package is new ada.numerics.discrete_random (random_integer_range);
 	use     random_integer_package;
@@ -57,6 +57,8 @@ procedure xerbia is
 	resource     : array (resource_type)     of integer := (others => 0);
 	construction : array (construction_type) of natural := (others => 0);
 
+	reply : reply_type := help;
+
                                              ------------------------------------------------------------------------------------------
 
 	function randomize (minimum, maximum : in integer) return integer is
@@ -84,13 +86,27 @@ procedure xerbia is
 
                                              ------------------------------------------------------------------------------------------
 
+	function limited_string_equality (input, equal : in string) return boolean is
+	begin
+		for index in equal'range loop
+			if input (index) /= equal (index) then
+				return false;
+			end if;
+		end loop;
+		--
+		return true;
+	end limited_string_equality;
+
+                                             ------------------------------------------------------------------------------------------
+
 	function query_reply return reply_type is
 		input : string (1 .. 1024);
+		count : integer;
 	begin
-		loop input := get_line;
+		loop get_line (input, count);
 		--
 		for index in reply_type loop
-			if input <= reply_type'image (index) then
+			if limited_string_equality (input, reply_type'image (index)) then
 				return (index);
 			end if;
 		end loop;
@@ -104,11 +120,12 @@ procedure xerbia is
 
 	function query_construction return construction_type is
 		input : string (1 .. 1024);
+		count : integer;
 	begin
-		loop input := get_line;
+		loop get_line (input, count);
 		--
 		for index in construction_type loop
-			if input = construction_type'image (index) then
+			if limited_string_equality (input, construction_type'image (index)) then
 				return (index);
 			end if;
 		end loop;
@@ -172,8 +189,95 @@ procedure xerbia is
 
                                              ------------------------------------------------------------------------------------------
 
+	procedure build_construction is
+		reply : construction_type;
+		lacks : integer;
+	begin
+		for index in construction_type loop
+			put (grey ("->") & " build " & blue (construction_type'image (index)) & " (");
+			--
+			for price in resource_type loop
+				if (construction_price (index, price) > 0) then
+					if resource (price) < construction_price (index, price) then
+						put (resource_type'image (price) & red (integer'image (construction_price (index, price))));
+					else
+						put (resource_type'image (price) & green (integer'image (construction_price (index, price))));
+					end if;
+				end if;
+				--
+				if price /= resource_type'first and price /= resource_type'last then
+					put (", ");
+				end if;
+			end loop;
+			--
+			put_line (");");
+		end loop;
+		--
+		separator;
+		--
+		reply := query_construction;
+		--
+		separator;
+		--
+		for index in resource_type loop
+			if resource (index) < construction_price (reply, index) then
+				lacks := construction_price (reply, index) - resource (index);
+				--
+				put_line ("You're lacking " & red (resource_type'image (index)) & ", need" & red (lacks'image) & " more.");
+				put_line ("Your architect humbly refused to build " & construction_type'image (reply) & ".");
+				--
+				separator;
+				return;
+			end if;
+		end loop;
+		--
+		for index in resource_type loop
+			resource (index) := resource (index) - construction_price (reply, index);
+		end loop;
+		--
+		construction (reply) := construction (reply) + 1;
+		--
+		put_line ("Construction of " & green (construction_type'image (reply)) & " was completed successfully.");
+		--
+		separator;
+	end build_construction;
+
                                              ------------------------------------------------------------------------------------------
 
+	procedure compute_turn is
+		problem : constant array (resource_type) of access string := (
+			new string'("rats"),
+			new string'("thieves"),
+			new string'("rotting"),
+			new string'("cracking")
+		);
+		--
+		gained, lost : integer := 0;
+	begin
+		put_line ("Your strategy has been submitted to the council, now you can only wait.");
+		put_line ("...");
+		put_line ("One month later, your advisor brings your short report on activities in your fortress.");
+		--
+		for index in resource_type loop
+			gained           := construction (construction_type'val (resource_type'pos (index))) * 20;
+			lost             := randomize (1, 10);
+			resource (index) := resource (index) + gained - lost;
+			--
+			put_line ("Your fortress gained" & green (gained'image) & " units of " & resource_type'image (index) & ", but lost" & red (lost'image) & " due to " & problem (index).all & ".");
+		end loop;
+		--
+		reputation       := reputation + randomize (-3, 3) + resource (gold) / 120 + resource (wheat) / 60;
+		migration        :=  randomize (0, 6) - resource (wheat) / 120;
+		population       := population + migration;
+		resource (wheat) := resource (wheat) - population / 3;
+		resource (gold)  := resource (gold) - abs reputation / 3;
+		--
+		put_line ("Beside that, " & red (integer'image (population / 3)) & " units of wheat was spent on feeding the people.");
+		put_line ("Also, only " & red (integer'image (abs reputation / 3)) & " gold was spent inside castle.");
+		--
+		separator;
+	end compute_turn;
+
 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 
 begin
@@ -199,10 +303,30 @@ begin
 	put_line (grey ("-- "));
 	put_line (grey ("-- ") & blue ("Ognjen 'xolatile' Milan Robovic"));
 
-	print_help;
-	print_resources;
+	gameplay: loop
+		separator;
+
+		exit when reply = quit;
+
+		case reply is
+			when help   => print_help;
+			when report => print_resources;
+			when status => print_statistics;
+			when build  => build_construction;
+			when turn   => compute_turn;
+			when others => null;
+		end case;
+
+		reply := query_reply;
+	end loop gameplay;
+
+	separator;
+
 	print_constructions;
-	print_statistics;
+
+	put_line (grey ("The end!"));
+
+	separator;
 
 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------