Task: Program Execution
Input (English): 4949, k, 3961, 5119, 77, 7651, 9057, 1805, B, 7035, 6475, l, 6957, X, H, O, 4567, 8671, p, 5201, 8525
Output (English): 1, 3, 4, 5, 6, 7, 8, 10, 11, 13, 17, 18, 20, 21