Task: Program Execution
Input (English): b, F, E, 8905, 6215, e, F, a, R, 7567, 9351, 1269, a, 7709, 3521, 5477, r, f, 4981, 1421, N, F, 6065, 8263
Output (English): 1, 2, 3, 6, 7, 8, 9, 13, 17, 18, 21, 22