Task: Program Execution
Input (English): 2, ['7923', 'J', 'Z', '3015', 'Z', 'F', 'M', '4459', 'X', '43', '2567', '4107', '1885', '6759', 'B', '6395', '1211', 'x', '8447', 'S', '7909']
Output (English): 7923, J