Task: Program Execution
Input (English): 3817, b, 5721, 177, 2329, I, F, 9945, 3537, 6443, o, G, X, y, 8547, b, 2503, 9381, j, G
Output (English): 1, 3, 4, 5, 8, 9, 10, 15, 17, 18