Task: Program Execution
Input (English): 6451, B, 4439, 3589, 9231, s, 9477, 1329, W, W, 3951, y, 5629, U, Q, 7197, 2521, f, 5159, F
Output (English): 2, 6, 9, 10, 12, 14, 15, 18, 20