Task: Program Execution
Input (English): 8, 12, ['j', 'F', '5867', '1781', 'y', 'T', '4145', '3571', 'F', 'K', 'x', 'K', 'E', '8487', '4319', 'B', 'P', 'R']
Output (English): 3571FKxK