Task: Program Execution
Input (English): 9, ['3909', '9591', '6407', '8349', 'n', 'B', 'a', '6207', 'Y', '1977', 'r', '7547', '559', 'r', '9721', '8709', 'c', '5019', 'u', '1249']
Output (English): 3909, 1977, u