In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['b', 'p', 'j', 'v', 'u', 'L', '4261', '9285', 'k', 'o', 'G', 'X'], ['K', 'u', 1551, 'B', 'u', 'L', '4261', '9285', 'l', 5657, 'R', 'V']