In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['C', 9817, 'Z', 6277, '3429', 'L', '2415', '1881', '8945', 'l', 8869, 285, 8703], ['d', 's', 3787, '3429', 'L', '2415', '1881', '8945', 'k', 4191, 315, 701, 7259]