Task: Program Execution
Input (English): 20, 21, ['D', 'Z', 'z', '5407', '5653', 'l', 'g', '9989', '3933', '3545', '1849', 'x', 'D', '4951', 'R', 'o', '3285', 'v', '6019', 'I', '7717', '8899', '9781', '2493', 'u']
Output (English): 7717I