Task: Program Execution
Input (English): 4, 8, ['U', 'f', 'X', 'f', 'Y', 'g', 'j', 'B', 'U', '7991', '2921', '3181', '2763', '8207', '7239', 'y', '663', '8369', 'A', '2931', '8287', '2205']
Output (English): BjgYf