Task: Program Execution
Input (English): 1, 21, ['X', '8417', 'F', 'n', '2015', '7307', '4551', 'v', 'c', '815', 'k', 'h', 'r', '557', 'l', '3381', 'p', 'z', 'U', '5271', '7299', '6709']
Output (English): X8417Fn201573074551vc815khr557l3381pzU52717299