diff --git a/Lesson05/Lesson05/Program.cs b/Lesson05/Lesson05/Program.cs
index e8c95d7..dc5f680 100644
--- a/Lesson05/Lesson05/Program.cs
+++ b/Lesson05/Lesson05/Program.cs
@@ -4,7 +4,44 @@ internal class Program
     {
         static void Main(string[] args)
         {
-            Console.WriteLine("Hello, World!");
+            Person person = new Person();
+            Display(person);
+
+            Animal animal = new Animal();
+            Display(animal);
+
+            Cat cat = new Cat();
+            Display(cat);
         }
+
+        static void Display(IRunnable runnable)
+        {
+            runnable.Run();
+        }
+    }
+
+    interface IRunnable
+    {
+        public void Run();
+    }
+
+    class Person : IRunnable
+    {
+        public void Run()
+        {
+            Console.WriteLine("Person Running");
+        }
+    }
+
+    class Animal : IRunnable
+    {
+        public void Run()
+        {
+            Console.WriteLine("Animal running");
+        }
+    }
+
+    class Cat : IRunnable
+    {
     }
 }
\ No newline at end of file