Task: Program Execution
Input (English): 21, 23, ['P', '7371', 'F', 'Z', 'n', 'z', '6883', 'B', 'q', '5665', '7191', 'r', 'r', '4421', 'O', '4013', 'O', '8487', '4411', '7993', '487', 'W', 'M', '1581', 'O', 'Q']
Output (English): 487, W, M