Task: Program Execution
Input (English): 21, 21, ['2419', 'm', '289', 'g', 's', 'U', '8461', 'q', '3177', 'J', '3877', 'w', 'b', '4411', '9161', '7461', 'y', '8151', 'v', '4145', 'B', 'D', 'X', '7763', '143']
Output (English): B