In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['u', 8803, 1737, 5959, 'S', 2815, 'r', 'r', 'f', '543', 'n', 'k', 'f', 'S', '6371', 'J', '2367', 'F', 'D', '7529', '6913', '8981', 'j', 'i', 'x', 8769, 'l', 'g', 'Z', 9007, 'C', 'Q', 'k', 'l', 'T'], [5393, 'g', 'R', 'r', 'r', 'f', '543', 'n', 'k', 'f', 'S', '6371', 'J', '2367', 'F', 'D', '7529', '6913', '8981', 'j', 'i', 'j', 'j', 2047, 'b']