Task: Program Execution
Input (English): L, 517, 8089, f, 7307, 5903, X, 25, 1349, 883, 2549, l, 2723, 8711, 7777, 5553, m, O, 2511, E, X, 7283
Output (English): 1, 4, 7, 12, 17, 18, 20, 21