Task: Program Execution
Input (English): 17, 21, ['d', '8123', 'u', '6045', '6167', 'b', '4021', 'z', 'g', '5937', '7649', 'M', 'v', '3099', 'W', 'J', 'T', '1535', 'W', '7625', '409']
Output (English): T1535W7625409