In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[2459, 4725, 1911, 'y', 1597, 'y', 'L', 'h', '6569', 'c', '7823', 'T', 'O', '6965', 'R', 't', '3345', 'f', '9399', 'N', '3161', 'm', 'G', 'Q', 'Y', 'm', 1425, 1267, 905, 'I', 4963, 417, 'I', 1723, 'n', 'Z', 'J'], ['u', 's', 'n', 'I', 6299, 'W', 'y', 'L', 'h', '6569', 'c', '7823', 'T', 'O', '6965', 'R', 't', '3345', 'f', '9399', 'N', '3161', 'm', 'G', 'Q', 'w', 'c', 'b', 'x', 3877, 8735, 6289, 'j', 231, 6871, 'A', 271, 7165, 3213]