diff --git a/AoC/2015/day_5/day_5.adb b/AoC/2015/day_5/day_5.adb
new file mode 100644
index 0000000..2bc270f
--- /dev/null
+++ b/AoC/2015/day_5/day_5.adb
@@ -0,0 +1,138 @@
+with Ada.Text_IO; use Ada.Text_IO;
+with Ada.Strings; use Ada.Strings;
+with Ada.Strings.Fixed; use Ada.Strings.Fixed;
+
+procedure Day_5 is
+
+    type Contained is new String( 1 .. 2 );
+
+    type Container is array (Natural range <>) of Contained;
+    type Nat_Array is array (Natural range <>) of Natural;
+
+    function Find( DUT : String; Member : Container ) return Boolean is
+        Index : Nat_Array( Member'First .. Member'Last) := (Others => 1);
+    begin
+        for Char_Idx in DUT'Range loop
+            for Mem_Idx in Member'Range loop
+                if DUT(Char_Idx) = Member(Mem_Idx)(Index(Mem_Idx)) then
+                    if Index(Mem_Idx) = Member(Mem_Idx)'Last then
+                        return True;
+                    end if;
+                    Index(Mem_Idx) := @ + 1;
+                else
+                    Index(Mem_Idx) := Member(Mem_Idx)'First;
+                end if;
+            end loop;
+        end loop;
+
+        return False;
+    end Find;
+
+    function Count_Vowels( DUT : String ) return Natural is
+        Sum : Natural := 0;
+    begin
+        for I in DUT'Range loop
+            case DUT(I) is
+                when 'a' | 'e' | 'i' | 'o' | 'u' => Sum := @ + 1;
+                when others => null;
+            end case;
+        end loop;
+
+        return Sum;
+    end Count_Vowels;
+
+    function Multi_Letters( DUT : String ) return Boolean is
+        Letter : Character := DUT(DUT'First);
+    begin
+        for I in DUT'First + 1 .. DUT'Last loop
+            if DUT(I) = Letter then
+                return True;
+            else
+                Letter := DUT(I);
+            end if;
+        end loop;
+
+        return False;
+    end Multi_Letters;
+
+    function Has_Repeat_Sequence( DUT : String ) return Boolean is
+    begin
+        for I in DUT'First .. DUT'Last - 1 loop
+            for J in I+2 .. DUT'Last -1 loop
+                if DUT(I) = DUT(J) and DUT(I+1) = DUT(J+1) then
+                    return True;
+                end if;
+            end loop;
+        end loop;
+
+        return False;
+    end Has_Repeat_Sequence;
+
+    function Has_Repeat_Letters( DUT : String ) return Boolean is
+    begin
+        for I in DUT'First .. DUT'Last - 2 loop
+            if DUT(I) = DUT(I+2) then
+                return True;
+            end if;
+        end loop;
+
+        return False;
+    end Has_Repeat_Letters;
+
+    function Nice(DUT : String ) return Boolean is
+        A : Container := ("ab", "cd", "pq", "xy");
+    begin
+        if Find(DUT, A) then
+            return False;
+        else
+            return (Count_Vowels(DUT) >= 3) and Multi_Letters(DUT);
+        end if;
+    end Nice;
+
+    function Nice_2(DUT : String ) return Boolean is
+    begin
+        return Has_Repeat_Sequence(DUT) and Has_Repeat_Letters(DUT);
+    end Nice_2;
+
+    function Day_5_1(File_Name : String) return Natural is
+        File : File_Type;
+        Sum : Natural := 0;
+    begin
+        Open(File, In_File, File_Name);
+
+        while not End_Of_File(File) loop
+            case Nice(Get_Line(File)) is
+                when True => Sum := @ + 1;
+                when False => null;
+            end case;
+        end loop;
+
+        Close(File);
+
+        return Sum;
+    end Day_5_1;
+
+    function Day_5_2(File_Name : String) return Natural is
+        File : File_Type;
+        Sum : Natural := 0;
+    begin
+        Open(File, In_File, File_Name);
+
+        while not End_Of_File(File) loop
+            case Nice_2(Get_Line(File)) is
+                when True => Sum := @ + 1;
+                when False => null;
+            end case;
+        end loop;
+
+        Close(File);
+
+        return Sum;
+    end Day_5_2;
+
+begin
+
+    Put_Line(Day_5_1("input_day_5.txt")'Image);
+    Put_Line(Day_5_2("input_day_5.txt")'Image);
+
+end Day_5;