Task: Program Execution
Input (English): 1, 1, ['U', '2203', 'L', 'l', '6115', 'Y', 'p', '9061', '6433', '7473', '2331', '6325', 'k', '7911', 'V', 'h', '4501', 'v', 'U', '5783']
Output (English): U