Task: Program Execution
Input (English): 9459, 9887, 8285, j, 4521, 923, X, X, 4695, 3727, U, 7287, t, 6659, E, t, Q, q, v, 5491, 5585, F, X, 1771
Output (English): 4, 7, 8, 11, 13, 15, 16, 17, 18, 19, 22, 23