In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['B', 9863, 243, 'l', 'D', '7807', '917', 'W', 'j', 7333, 'q'], ['R', 'l', 'q', 'D', '7807', '917', 'W', 'L', 8575, 465, 715]