Task: Program Execution
Input (English): 16, 17, ['C', '4841', '1667', 'L', '4207', '857', '6755', 'Y', '4405', 'j', 'x', 'k', '3777', 'n', 'w', 'Y', '3723', 'Q', '1725', 'h', 'a']
Output (English): Y3723