Task: Program Execution
Input (English): 1, ['Z', '4037', 'i', '567', 'Z', '5429', '9851', '899', 'a', '195', '1799', 'H', 'D', '3047', 'k', '971', '1235', '1401', 'M', 'L', 'K', '9909', 'Y', 'a', 'O', 'z', 'O']
Output (English): Z