Task: Program Execution
Input (English): b, 1573, p, 4791, 6925, T, N, 2255, 6657, 2025, G, 2217, 7617, 1391, T, Z, 943, b, B, f, 9129
Output (English): 2, 4, 5, 8, 9, 10, 12, 13, 14, 17, 21