Task: Program Execution
Input (English): 4, 4, ['5307', 'x', '3755', 'U', '2905', '5445', 'w', '3355', 'Z', 'u', 'q', '3129', '8647', '2847', '6189', 'i', 'q', '7749', 'P', '473', '6081', 'G', '2333']
Output (English): U