diff --git a/src/main/c/sudoku.c b/src/main/c/sudoku.c
index 560e174..792f227 100644
--- a/src/main/c/sudoku.c
+++ b/src/main/c/sudoku.c
@@ -381,7 +381,24 @@ void tipFunction(int grid[SIZE][SIZE]) {
 
     switch (option) {
         case 1:
-            printf("Case 1\n");
+             printf("Enter the coordinates (row and column) separated by space:\n");
+            int row, col;
+
+            while (true){
+            char row_str[10];
+            char col_str[10];
+            scanf("%s %s", row_str, col_str);
+
+
+            row = row_str[0] - '0'; // Convert the first character to an integer
+            col = col_str[0] - '0'; // Convert the first character to an integer
+
+            if (((row >= 1 && row <= 9) && row_str[1] == '\0') && ((col >= 1 && col <= 9) && col_str[1] == '\0')) {
+                break;
+            } else {
+                printf("Invalid input. Please enter a number between 1 and 9.\n");
+            }
+        }
             break;
 
         case 2: