In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[4473, 9577, 'L', 'i', 's', 7507, 5303, 'I', 'Y', 3629, 'r', 'W', 'N', 9581, 2067, 9911, 't', 'Z', '8317', '7641', 't', 'p', 'O', '9881', 'r', '1603', 'b', 'N', 'W', '6589', '6775', '4223', '5091', 'X', 'b', '6183', 'v', 859, 'w', 'D', 'U', 4469, 9775, 'T', 5349, 'y', 'R', 3783, 'L'], [9567, 'x', 9475, 1091, 'S', 5597, 6503, 'B', 'b', 'Z', '8317', '7641', 't', 'p', 'O', '9881', 'r', '1603', 'b', 'N', 'W', '6589', '6775', '4223', '5091', 'X', 'b', '6183', 'g', 2507, 3461, 2555]