Task: Program Execution
Input (English): 13, 21, ['X', '8225', '8201', '6643', '6793', '4141', 'x', 's', 'n', 'N', 'R', '2489', '2943', 'F', '7571', 's', '9821', 'l', '505', '5373', '4427', '487', 'F', '691', 'J']
Output (English): 2943, F, 7571, s, 9821, l, 505, 5373, 4427