In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[6089, 7885, 7053, 'b', '7871', '6663', '6521', '4281', 'G', 1615, 1171, 7017], [4579, 9463, 'M', 7893, '7871', '6663', '6521', '4281', 'X', 1111]