Task: Program Execution
Input (English): 15, 19, ['a', 'q', '5705', '4973', '2497', '8733', 'X', '3007', 'I', 'O', '8883', '9689', '8493', 'x', 'r', '4315', '3885', 'X', 'l']
Output (English): r43153885Xl