Task: Program Execution
Input (English): 3, 20, ['U', 'N', '4009', 'B', 'H', 'f', 'h', '1703', 'u', '7141', 'u', 'K', '135', 'b', 'l', 's', '2013', '2785', '2047', '2001', 'w', 'v', '6957', '241']
Output (English): 2001204727852013slb135Ku7141u1703hfHB4009