Task: Program Execution
Input (English): 19, 20, ['8297', '7353', 'h', 'j', 'W', 'V', '879', '3973', '5879', 'J', 'B', '4259', 'T', 'V', 'i', 'B', 'P', '1277', '8435', 'A', 'b']
Output (English): 8435A