In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['N', 5775, 'u', 4163, 'X', 'N', 'x', 'T', 'x', 1463, 3993, 'x', 'j', 'a', 'P', '1321', 'd', 'k', '1003', '5611', '1357', 's', 'I', 'r', '2645', 'f', 'h', '7651', '3223', '2323', '2693', '7825', '1315', '6359', 'j', 'W', 'm', 'P', '7529', 'Y', 'C', 't', 683, 5345, 'm', 6429, 'H', 6881, 'O', 'M', 6033, 's', 'N', 'T', 'H', 'Y', 'V', 'P', 3179], [1207, 1331, 'P', 'f', '1321', 'd', 'k', '1003', '5611', '1357', 's', 'I', 'r', '2645', 'f', 'h', '7651', '3223', '2323', '2693', '7825', '1315', '6359', 'j', 'W', 'm', 'P', '7529', 'b', 7839, 'V', 5833, 'J', 7385, 'x', 6681, 8093, 7437]