Task: Program Execution
Input (English): 14, 15, ['2525', 'm', '7307', '3879', 'X', '2859', '5623', '769', 'W', 'v', '9383', 'a', '3787', '6785', 'z', '8553', 'Y', 'W', '8217', '8879', '7581', '5769']
Output (English): 6785z