Task: Program Execution
Input (English): 14, 17, ['M', '7979', '4373', 'j', 'B', 'b', 'A', 'x', 'x', 'G', 'v', '4235', '4493', 'x', 'P', '8763', 'W', '9', 'r', '2551', 'x', 'C']
Output (English): W8763Px