Task: Program Execution
Input (English): 17, 21, ['8251', '4719', '2137', 'H', 'g', '5847', '2503', '8821', '8445', '9847', 'S', 'n', '909', 'x', '5185', '4915', 'Z', 'N', '3449', 'D', 'N', 'U', 'N']
Output (English): ZN3449DN