diff --git a/Program.cs b/Program.cs
index d0e2789..6f6b112 100644
--- a/Program.cs
+++ b/Program.cs
@@ -29,7 +29,7 @@ class Program {
                     break;
                 case 3:
                     Console.Clear();
-                    
+                    Submenu();
                     Pausa();
                     break;
                 case 4:
@@ -105,5 +105,54 @@ class Program {
         return ritorno;
     }
 
-    
+    static void Submenu(){
+        Console.Clear();
+        string frase, input;
+        int scelta;
+
+        Console.Write("Inserire una frase: ");
+        input = Console.ReadLine();
+        Console.Clear();
+
+        do {
+            frase = input;
+            Console.WriteLine($"Frase corrente: {frase}");
+            Console.WriteLine();
+            Console.WriteLine("Inserire un'opzione:");
+            Console.WriteLine("1. Converti in minuscolo");
+            Console.WriteLine("2. Converti in maiuscolo");
+            Console.WriteLine("3. Sostituisci \'.\' con \\n");
+            Console.WriteLine("0. Esci");
+            Console.Write("Scelta: ");
+            scelta = Convert.ToInt32(Console.ReadLine());
+
+            switch (scelta) {
+                case 0:
+                    break;
+                case 1:
+                    Console.Clear();
+                    frase = frase.ToLower();
+                    Console.WriteLine($"Frase in minuscolo: {frase}");
+                    Pausa();
+                    break;
+                case 2:
+                    Console.Clear();
+                    frase = frase.ToUpper();
+                    Console.WriteLine($"Frase in maiuscolo: {frase}");
+                    Pausa();
+                    break;
+                case 3:
+                    Console.Clear();
+                    Console.WriteLine($"Frase con \\n: {frase.Replace(".", "\\n")}\n\n");
+                    Console.WriteLine($"Frase con \\n interpretato: {frase.Replace(".", "\n")}");
+                    Pausa();
+                    break;
+                default:
+                    Console.WriteLine("Opzione non valida.");
+                    Pausa();
+                    break;
+            }
+        }
+        while (scelta != 0);
+    }
 }
diff --git a/bin/Debug/net9.0/strings_1.dll b/bin/Debug/net9.0/strings_1.dll
index 33e24e8..51dd907 100644
Binary files a/bin/Debug/net9.0/strings_1.dll and b/bin/Debug/net9.0/strings_1.dll differ
diff --git a/bin/Debug/net9.0/strings_1.pdb b/bin/Debug/net9.0/strings_1.pdb
index bdd982a..45c176c 100644
Binary files a/bin/Debug/net9.0/strings_1.pdb and b/bin/Debug/net9.0/strings_1.pdb differ
diff --git a/obj/Debug/net9.0/ref/strings_1.dll b/obj/Debug/net9.0/ref/strings_1.dll
index 1a544cf..50fa42f 100644
Binary files a/obj/Debug/net9.0/ref/strings_1.dll and b/obj/Debug/net9.0/ref/strings_1.dll differ
diff --git a/obj/Debug/net9.0/refint/strings_1.dll b/obj/Debug/net9.0/refint/strings_1.dll
index 1a544cf..50fa42f 100644
Binary files a/obj/Debug/net9.0/refint/strings_1.dll and b/obj/Debug/net9.0/refint/strings_1.dll differ
diff --git a/obj/Debug/net9.0/strings_1.AssemblyInfo.cs b/obj/Debug/net9.0/strings_1.AssemblyInfo.cs
index 08d44ad..c7e3c11 100644
--- a/obj/Debug/net9.0/strings_1.AssemblyInfo.cs
+++ b/obj/Debug/net9.0/strings_1.AssemblyInfo.cs
@@ -13,7 +13,7 @@ using System.Reflection;
 [assembly: System.Reflection.AssemblyCompanyAttribute("strings_1")]
 [assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
 [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+9a6a7d033df24618f23d8c678ad89ad9da11fd5f")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+fc5e00d760f79e678e9cd4784cb86739463eae8a")]
 [assembly: System.Reflection.AssemblyProductAttribute("strings_1")]
 [assembly: System.Reflection.AssemblyTitleAttribute("strings_1")]
 [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
diff --git a/obj/Debug/net9.0/strings_1.AssemblyInfoInputs.cache b/obj/Debug/net9.0/strings_1.AssemblyInfoInputs.cache
index c7ccdbe..92ba4fb 100644
--- a/obj/Debug/net9.0/strings_1.AssemblyInfoInputs.cache
+++ b/obj/Debug/net9.0/strings_1.AssemblyInfoInputs.cache
@@ -1 +1 @@
-026fc32c5f2b08f1f28bf8d9d499576953af691b4c04f7de6e6d7956b19089a8
+e3ce3c7de95ef6326cdd83691d152ba9a50ea4fbf3aaa1a3ecd06cdf889c90e9
diff --git a/obj/Debug/net9.0/strings_1.dll b/obj/Debug/net9.0/strings_1.dll
index 33e24e8..51dd907 100644
Binary files a/obj/Debug/net9.0/strings_1.dll and b/obj/Debug/net9.0/strings_1.dll differ
diff --git a/obj/Debug/net9.0/strings_1.pdb b/obj/Debug/net9.0/strings_1.pdb
index bdd982a..45c176c 100644
Binary files a/obj/Debug/net9.0/strings_1.pdb and b/obj/Debug/net9.0/strings_1.pdb differ