In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['R', 9933, 2661, 'A', 'k', '2143', 'M', '4069', '9017', 'M', 'B', '1359', '1975', '3271', 'v', '3887', '4509', 'j', 'k', 'm', 'N', 4349, 8205, 8543, 'Q', 991, 'g', 't', 'n', 4751, 8759], ['m', 'B', 309, 'X', 'b', 1689, 473, 'b', 'R', 'A', 'k', '2143', 'M', '4069', '9017', 'M', 'B', '1359', '1975', '3271', 'v', '3887', '4509', 'j', 'k', 'm', 'D', 'g', 3799, 'O', 7723, 3823]