In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['H', 6097, 'E', 4489, 5603, 1571, '8131', '7435', 't', '1221', '3265', '5267', 'Y', 9063], ['j', 'q', 'm', 'u', 'u', 'k', '8131', '7435', 't', '1221', '3265', '5267', 'F', 'l', 'f', 8751, 4207, 'a']