Task: Program Execution
Input (English): 11, 15, ['s', '1601', '1221', '9269', 'W', '1691', 'M', 's', 'a', '7999', 'Y', '3469', 'H', 'K', 'M', '2153', 'N', 'P', '9777', '3073']
Output (English): MKH9643Y