In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[4261, 'C', 1073, 3285, '6521', 'Z', '6999', 'q', 'e', 'v', 'Z'], ['B', 3785, '6521', 'Z', '6999', 'q', 'c', 'O', 'c']