Task: Program Execution
Input (English): 12, ['B', '4885', 'O', 'n', 'a', 'w', '2915', 'L', 'B', '6397', '9099', 'k', 'F', '5399', 'U', '6003', 'o', '7091', 'h', '5719', 'A', '4221', '5741', '2737', 'a']
Output (English): B, F, a