Task: Program Execution
Input (English): w, 6991, 9735, 6753, O, 7407, 2665, 5759, z, O, q, 587, 4897, f, L, 4437, i, 1413, 8633, 9947, F
Output (English): 1, 5, 9, 10, 11, 14, 15, 17, 21