In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[2765, 7379, 3807, 'd', 541, 8729, 'u', 'C', 'L', 'X', 'f', 'd', '4541', 'b', 'a', 'o', 7565], [7621, 2063, 1407, 'P', 6175, 'P', 'C', 'L', 'X', 'f', 'd', '4541', 'b', 'a', 'F', 6905, 'G', 'z', 'b', 7003, 5421]