Task: Program Execution
Input (English): G, 1249, 7377, 8333, o, 9895, H, 8979, Z, 8397, 1147, 8771, 6425, 8129, z, 9745, E, 9835, N, n, 1581, f, I
Output (English): 2, 3, 4, 6, 8, 10, 11, 12, 13, 14, 16, 18, 21