Task: Program Execution
Input (English): 15, 21, ['4065', '5511', '8799', 'u', '6833', '7559', 'c', '2637', 'y', '7705', '109', '9933', '3025', 'E', 'l', '3711', 'd', 'W', '6289', '3755', 'X', '7631', 'i', '5027', '3723', 'b', 'f', '2193', 'B']
Output (English): X37556289Wd3711l