Task: Program Execution
Input (English): 3, 7, ['C', '4741', '7043', 'J', 'W', 'u', '793', '8339', 'U', 'x', '4563', '3023', 'y', '243', 'r', 'u', 'u', '7353', 'v', '1417', '4471']
Output (English): 7043, x, u