In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[3631, 4883, 'u', 'T', 'x', 'S', 2877, 'M', 'c', 'A', 'u', 131, 'o', 7287, 't', 'Q', 'x', 'F', 'T', 'q', 'a', 'u', 'M', 'T', '8721', '4159', 'G', 'a', '6587', 't', 'i', 'U', 'C', '7839', '4657', 'k', '9657', 'Y', 'V', '2919', '807', 'b', 'y', 'c', 159, 't', 1801, 2383, 7305, 6657, 'm', 'F', 3731, 4229, 9537, 'F', 'n', 8839, 5285, 'i', 5955, 'd', 8397, 'f', 4101, 'b'], ['f', 'n', 'n', 6347, 4539, 7291, 'L', 1867, 9287, 'D', 2565, 8979, 'w', 5133, 'N', 6227, 'q', 'a', 'u', 'M', 'T', '8721', '4159', 'G', 'a', '6587', 't', 'i', 'U', 'C', '7839', '4657', 'k', '9657', 'Y', 'V', '2919', '807', 'b', 'y', 'G', 'X', 'f', 4087, 6633, 8271, 'G', 1871, 705, 'm', 8321, 3957, 7013, 'K', 'e', 3969, 5139, 9829, 2097, 'm']