Task: Program Execution
Input (English): 825, r, 9421, U, i, d, 6239, 7069, 3781, p, t, 4281, 2261, 5685, y, b, 9625, f, 3227, 3865, R
Output (English): 1, 3, 7, 8, 9, 12, 13, 14, 17, 19, 20