Task: Program Execution
Input (English): 7771, 6921, W, M, w, 8377, w, R, E, 1205, 7757, v, 8601, b, 967, 4007, 2943, 6563, 8903, 3763, 2763, f
Output (English): 1, 2, 6, 10, 11, 13, 15, 16, 17, 18, 19, 20, 21