Task: Program Execution
Input (English): 3, ['6087', 'a', 'm', '7975', 'W', 'M', '2323', '5353', 'i', '9991', 'Y', 'W', '7419', 'F', 'l', 'Z', '6637']
Output (English): 6087, 7975, 2323, 9991, 7419, Z