Task: Program Execution
Input (English): 6231, 4475, 1007, 9671, X, x, T, 3829, 1427, G, 2255, O, 2243, 5319, 4507, q, u, W, 1085, 2771, S, T, B
Output (English): 5, 6, 7, 10, 12, 16, 17, 18, 21, 22, 23