Task: Program Execution
Input (English): 22, 22, ['9283', '6367', '7771', '3797', 'c', '6207', 'm', 'I', '3217', 'U', '47', 'o', '4171', 'C', 'b', '9229', '123', 's', '9481', '1231', '5381', 'U', '7257', 'C', '2639', 'a']
Output (English): U