diff --git a/Fizetes/Fizetes.csproj b/Fizetes/Fizetes.csproj
index 6b81dea..dc4f1df 100644
--- a/Fizetes/Fizetes.csproj
+++ b/Fizetes/Fizetes.csproj
@@ -45,7 +45,7 @@
   <ItemGroup>
     <Compile Include="BankiUtalas.cs" />
     <Compile Include="FizetesMod.cs" />
-    <Compile Include="IAnozosito.cs" />
+    <Compile Include="IAnozosithato.cs" />
     <Compile Include="KartyasFizetes.cs" />
     <Compile Include="PayPalFizetes.cs" />
     <Compile Include="Program.cs" />
diff --git a/Fizetes/IAnozosito.cs b/Fizetes/IAnozosithato.cs
similarity index 82%
rename from Fizetes/IAnozosito.cs
rename to Fizetes/IAnozosithato.cs
index 4948370..3c0b2cf 100644
--- a/Fizetes/IAnozosito.cs
+++ b/Fizetes/IAnozosithato.cs
@@ -6,7 +6,7 @@ using System.Threading.Tasks;
 
 namespace Fizetes
 {
-    internal interface IAnozosito
+    internal interface IAnozosithato
     {
         void Azonosit();
     }
diff --git a/Fizetes/KartyasFizetes.cs b/Fizetes/KartyasFizetes.cs
index 19392de..e094382 100644
--- a/Fizetes/KartyasFizetes.cs
+++ b/Fizetes/KartyasFizetes.cs
@@ -6,7 +6,7 @@ using System.Threading.Tasks;
 
 namespace Fizetes
 {
-    internal class KartyasFizetes : FizetesMod, IAnozosito
+    internal class KartyasFizetes : FizetesMod, IAnozosithato
     {
         public void Azonosit()
         {
diff --git a/Fizetes/PayPalFizetes.cs b/Fizetes/PayPalFizetes.cs
index cc48083..1cfea3c 100644
--- a/Fizetes/PayPalFizetes.cs
+++ b/Fizetes/PayPalFizetes.cs
@@ -6,7 +6,7 @@ using System.Threading.Tasks;
 
 namespace Fizetes
 {
-    internal class PayPalFizetes : FizetesMod, IAnozosito
+    internal class PayPalFizetes : FizetesMod, IAnozosithato
     {
         public void Azonosit()
         {
diff --git a/Fizetes/Program.cs b/Fizetes/Program.cs
index 86538f5..0f438cc 100644
--- a/Fizetes/Program.cs
+++ b/Fizetes/Program.cs
@@ -19,8 +19,14 @@ namespace Fizetes
             list.Add(f1);
             list.Add(f2);
             list.Add(f3);
-            
 
+            foreach (var item in list)
+            {
+                if (item is IAnozosithato aobj)
+                {
+                    Console.WriteLine(item);
+                }else { Console.WriteLine(item); }
+            }
         }
     }
 }