Task: Program Execution
Input (English): 6, 12, ['s', '6391', 'y', '997', 'U', 'x', '9975', 'D', '4123', '9541', 't', '8421', '3599', 'O', 'i', 'M', '4509', 'P', '5045', '1577', '1499']
Output (English): 1248t14593214D5799x