In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['k', 'x', 'N', '3067', '1921', '4949', 'W', '5475', 't', 'O', 'u', 'Q', '9421', '2161', '8661', 'S', '5741', '8013', '2899', '5451', 'Y', 'z', 'p', '691', '4927', 'l', 'T', '6091', 'b', 2937], ['l', 7361, 4803, 'K', 'H', '3067', '1921', '4949', 'W', '5475', 't', 'O', 'u', 'Q', '9421', '2161', '8661', 'S', '5741', '8013', '2899', '5451', 'Y', 'z', 'p', '691', '4927', 'l', 'T', '6091', 'l', 'u', 6581, 'j', 2109, 'y', 3417, 'y', 3863, 'D', 4907, 5069, 8551, 8241, 'k', 2975, 7441, 'Y']