diff --git a/otp.c b/otp.c
index 81a66df..cabb92c 100644
--- a/otp.c
+++ b/otp.c
@@ -101,37 +101,46 @@ int interactive_mode(void) {
     
     while (1) {
         show_main_menu();
-        int choice = get_user_choice(1, 6);
-        
-        switch (choice) {
-            case 1:
-                handle_generate_menu();
-                break;
-            case 2:
-                handle_encrypt_menu();
-                break;
-            case 3:
-                handle_decrypt_menu();
-                break;
-            case 4:
-                list_available_pads();
-                break;
-            case 5: {
-                printf("Enter pad checksum (or prefix): ");
-                char input[MAX_HASH_LENGTH];
-                if (fgets(input, sizeof(input), stdin)) {
-                    input[strcspn(input, "\n")] = 0;
-                    char* hash = find_pad_by_prefix(input);
-                    if (hash) {
-                        show_pad_info(hash);
-                        free(hash);
+        char input[10];
+        if (fgets(input, sizeof(input), stdin)) {
+            char choice = toupper(input[0]);
+            
+            switch (choice) {
+                case 'G':
+                    handle_generate_menu();
+                    break;
+                case 'E':
+                    handle_encrypt_menu();
+                    break;
+                case 'D':
+                    handle_decrypt_menu();
+                    break;
+                case 'L':
+                    list_available_pads();
+                    break;
+                case 'S': {
+                    printf("Enter pad checksum (or prefix): ");
+                    char input[MAX_HASH_LENGTH];
+                    if (fgets(input, sizeof(input), stdin)) {
+                        input[strcspn(input, "\n")] = 0;
+                        char* hash = find_pad_by_prefix(input);
+                        if (hash) {
+                            show_pad_info(hash);
+                            free(hash);
+                        }
                     }
+                    break;
                 }
-                break;
+                case 'X':
+                    printf("Goodbye!\n");
+                    return 0;
+                default:
+                    printf("Invalid option. Please select G, E, D, L, S, or X.\n");
+                    continue;
             }
-            case 6:
-                printf("Goodbye!\n");
-                return 0;
+        } else {
+            printf("Error reading input. Please try again.\n");
+            continue;
         }
         printf("\n");
     }
@@ -176,13 +185,13 @@ int command_line_mode(int argc, char* argv[]) {
 
 void show_main_menu(void) {
     printf("=== Main Menu ===\n");
-    printf("1. Generate new pad\n");
-    printf("2. Encrypt message\n");
-    printf("3. Decrypt message\n");
-    printf("4. List available pads\n");
-    printf("5. Show pad information\n");
-    printf("6. Exit\n");
-    printf("\nSelect option (1-6): ");
+    printf("\033[4mG\033[0menerate new pad\n");
+    printf("\033[4mE\033[0mncrypt message\n");
+    printf("\033[4mD\033[0mecrypt message\n");
+    printf("\033[4mL\033[0mist available pads\n");
+    printf("\033[4mS\033[0mhow pad information\n");
+    printf("E\033[4mx\033[0mit\n");
+    printf("\nSelect option (G/E/D/L/S/X): ");
 }
 
 int handle_generate_menu(void) {