Task: Program Execution
Input (English): 4, ['L', 'x', 'r', '2543', '3147', '1915', '3745', '6693', '4307', 'C', 'S', 'p', 'e', '6271', '2553', '9235', 'c', 'o', '5235']
Output (English): L, x, r, 2543