In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[8419, 9471, 8019, 'P', 'Y', 541, 8449, 7917, 'j', '6741', 'W', '993', '9537', '511', '3453', '2567', 'l', '9681', 'L', '4013', 'C', 'N', 'E', 7913, 907, 'G', 6023, 'I', 8469], [4301, 'b', 5717, 'Z', 'K', 6235, '6741', 'W', '993', '9537', '511', '3453', '2567', 'l', '9681', 'L', '4013', 'A', 'U', 1781, 1025, 'K', 7355, 319, 'r', 3907, 'w']