Task: Program Execution
Input (English): 16, 21, ['2231', '6685', 'U', '429', 'f', '9473', '309', 'y', '8267', '1751', 'w', '6949', '3051', '1073', 'G', '2071', '7051', '8077', 'D', 'k', '5043', '1589', '9245', '2181', '7429', 'x', '8057']
Output (English): 207170518077Dk5043