Task: Program Execution
Input (English): f, 2649, 2523, 2523, 8693, d, 9955, m, 917, X, b, 6561, s, P, 2277, 2441, C, v, E, 4389, 1771
Output (English): 2, 3, 4, 5, 7, 9, 12, 15, 16, 20, 21