Task: Program Execution
Input (English): o, M, b, 333, 935, x, 6705, x, 5241, 1359, 2125, c, 1327, W, c, 8737, 8323, u, 9867, 2187
Output (English): 4, 5, 7, 9, 10, 11, 13, 16, 17, 19, 20