Task: Program Execution
Input (English): 9, ['4751', '3527', '7157', '1005', '6663', 'o', '1335', '9827', '561', '4685', '8557', 'E', '5743', '6207', 'T', '7473', 'W', '1607', 'C', '6275', '8631']
Output (English): 4751, 4685, C