Task: Program Execution
Input (English): 1, 4, ['x', 's', 'P', 'e', '6629', 'B', 'u', '6383', '5201', 'W', '2181', 'W', '1961', 'Z', 'M', 'V', '3569', '2959', '5537']
Output (English): x, 6629, 5201, 1961, 3569