Task: Program Execution
Input (English): 4, 14, ['7537', '9147', 'U', '5537', '4729', '925', 'S', '6753', '8993', '9599', '4751', '2761', '9561', '3487', 'X', 'f', 'w', 'I', 'q', 'M']
Output (English): 55374729925S6753899395994751276195613487