Task: Program Execution
Input (English): 13, 15, ['6543', 'j', 'u', 'u', 'X', '2287', '5305', '229', 'G', '363', 'f', 'r', '887', 'H', 'M', 'x', '2449', '8015', 'I', '8789', '6571', '4645']
Output (English): MH788