Task: Program Execution
Input (English): 1439, x, w, 6817, 9551, e, 2737, o, f, 8019, M, 5473, 6163, 2615, r, 5761, w, 4301
Output (English): 1, 4, 5, 7, 10, 12, 13, 14, 16, 18