Task: Program Execution
Input (English): h, 8571, N, 3117, a, 2411, 401, 7121, f, 1287, f, 3151, 6987, F, 8563, q, 8615, 3195, H, l, 1305, L
Output (English): 2, 4, 6, 7, 8, 10, 12, 13, 15, 17, 18, 21