In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['U', 5665, 9339, 8183, 1981, 'd', '5021', 't', '7273', 'v', '8645', 'N', 'N', 'B', 's', '143', '5823', 'U', 'b', '9321', 'G', 'L', 6733, 'y', 'k'], ['t', 6349, 'g', 'V', 1157, 579, 'N', 'i', 5169, 2013, 2081, 'r', 'c', 'O', '5021', 't', '7273', 'v', '8645', 'N', 'N', 'B', 's', '143', '5823', 'U', 'b', '9321', 'H', 'W', 's', 'l', 'A', 'C', 5753, 925, 1229, 4977, 'A']