In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[6503, 4145, 9707, 'W', 'R', 'E', 'L', '8213', 'S', 'q', '9321', 'x', 'N', 'j', 'C', 'e', 'i', 'i', 'C', '5621', '1069', 'H', 'x', 'e', 'A', 'l', '6099', 'b', 7853, 'R', 'V'], ['i', 5501, 8913, 'H', 6133, 'L', '8213', 'S', 'q', '9321', 'x', 'N', 'j', 'C', 'e', 'i', 'i', 'C', '5621', '1069', 'H', 'x', 'e', 'A', 'l', '6099', 'Q', 'h', 'L', 'u', 6087, 'p', 2325, 9971, 'q', 7501, 3259]