Task: Program Execution
Input (English): 10, 15, ['s', '4221', '1373', 'S', 'N', 'u', 'S', 'c', '7911', 'm', '5637', '3643', 'a', 't', '5945', 'G', '405', '2885', 'E', '4673']
Output (English): m56373643at5945