Task: Program Execution
Input (English): 2, 3, ['257', '2971', 'I', 'U', 'a', '3979', 'J', '7651', '9957', '1757', '3107', 'F', 'i', 'g', '8507', 'F', 'q', '5167', 'E', 'x', '399', 'f', 'v', 'p', 'x', '337', '1591', 'f']
Output (English): 2971I