diff --git a/src/main/c/sudoku.c b/src/main/c/sudoku.c
index 77122dc..705e694 100644
--- a/src/main/c/sudoku.c
+++ b/src/main/c/sudoku.c
@@ -448,8 +448,35 @@ void tipFunction(int grid[SIZE][SIZE]) {
 
 void inputFunction(int grid[SIZE][SIZE]) {
     printf("\nInput function - Choose an action:\n");
+    printf("1. Insert value in an empty field\n");
+    printf("2. Clear an already filled field\n");
 
-    
+    int action;
+
+    while (true){
+            char in_str[10];
+            scanf("%s", in_str);
+
+            action = in_str[0] - '0'; // Convert the first character to an integer
+
+            if ((action >= 1 && action <= 2) && in_str[1] == '\0') {
+                break;
+            } else {
+                printf("Invalid input. Please enter a number between 1 and 2.\n");
+            }
+        }
+
+        switch (action) {
+            case 1:
+                printf("Case 1 \n");
+                break;
+            
+            case 2:
+                printf("Case 2 \n");
+                break;
+            default:
+                printf("Invalid input. Please enter 1 or 2.\n");
+        }
 }