Task: Program Execution
Input (English): 15, 21, ['d', '609', 'Q', '6031', '629', 'I', 'M', '7403', '9155', 'w', 's', 'v', 'd', 'm', '5551', '9701', 'D', '7849', '9675', '1671', '3557']
Output (English): 3557167196757849D97015551