Task: Program Execution
Input (English): 4, 9, ['7173', '6491', 'U', 'y', 's', '71', '6199', 'b', 'b', 'Q', '611', 'n', '5', 'f', '8587', 'b', 'U', 'X', 'V', '3369', 'I', 'B', 'b', '5235', 'B', '2031', '3541', 'g']
Output (English): y, 5, B