In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['U', 'i', 9863, 'b', 8513, 'E', 6273, 'e', 7407, 'Y', 't', 'W', 4141, '4881', '6117', 'd', 'q', 'D', 'u', 'T', 'Q', 'a', 'C', 'T', 'M', 'H', '143', '3809', '4421', '3473', 'S', 'M', 'h', '619', '1681', 'M', 2027, 4247, 'f', 87, 'r', 'K', 6101, 'n', 1871], [4437, 'Z', 'm', 1471, 'e', 'Z', 'u', 4753, 'T', 9653, 'k', 'r', 9583, 'v', 1601, '4881', '6117', 'd', 'q', 'D', 'u', 'T', 'Q', 'a', 'C', 'T', 'M', 'H', '143', '3809', '4421', '3473', 'S', 'M', 'h', '619', '1681', 'f', 'P', 6065, 2939, 9507, 'g', 5205, 5781, 7669, 283, 3819, 'e', 8217, 'P']