In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['G', 'W', 'y', '1607', '7521', 'w', '3409', 'y', '6675', '17', 'u', 'A', 'b'], [3523, 5619, 'z', '1607', '7521', 'w', '3409', 'y', '6675', '17', 'u', 'p', 'K', 'z', 9677, 'D', 2531]