Task: Program Execution
Input (English): 4, 5, ['255', '2423', 'X', 'z', 'w', 'L', '8879', '745', '4027', 'Y', 's', 'k', 'u', '4207', '5997', '1185', '8143', 'u', 'h', 'd', 'u', '1809']
Output (English): wz