Task: Program Execution
Input (English): 13, 15, ['W', '2713', 'x', 'J', 'l', '4677', '7899', 't', '701', 'x', 'j', '2079', '877', 'y', '9131', 'r', '8353', '2575', '8805', '8169']
Output (English): 9131y877