Task: Program Execution
Input (English): 5, 12, ['6357', '7781', 'J', '3869', 'E', '4183', '945', 'O', 'B', 'I', '1549', '4787', 'z', 'U', 'x', '9757', 'G', 'E']
Output (English): 78749451IBO5493814E