In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[6761, 'A', 'M', 'v', 2925, 'z', '5225', '2643', '9375', 'r', 'z', '639', '1403', '5181', 'i', '173', 'J', 'E', 'T', 'W', 'j', 1471, 4589, 9443], [7721, 'a', 'b', 'z', '5225', '2643', '9375', 'r', 'z', '639', '1403', '5181', 'i', '173', 'J', 'E', 'c', 45, 'K', 'g', 3277, 79, 'Q', 1941, 4581, 'M']