In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['H', 'A', 6837, 1279, 'P', 801, '4317', '5221', 'z', '5149', '1437', 'o', 'H', '2779', 'W', 'G'], [6663, 'v', '4317', '5221', 'z', '5149', '1437', 'o', 'H', '2779', 'f', 949, 'a', 9663, 's', 'i', 'x', 'i']