Task: Program Execution
Input (English): 3, 21, ['D', '6725', 'd', '2875', 'J', 'L', '801', 'j', 'y', '8777', '7169', '7403', '2593', 'x', 'n', '5971', 'E', '771', '2323', 'b', '1595', '8211', 'i', '6709', 'E', 'v', '6551']
Output (English): 5951b3232177E1795nx3952304796177778yj108LJ5782d