Task: Program Execution
Input (English): 8551, G, 3505, 7519, G, 5969, 2725, O, x, 1477, 7415, 6675, l, 1887, 227, S, U, 3125, C, 9773, D, t, 2575
Output (English): 1, 3, 4, 6, 7, 10, 11, 12, 14, 15, 18, 20, 23