In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[2067, 7079, 6327, 'f', 3703, 6977, '1961', '5671', '4207', '453', 'F', 'd', '1975', 'e', 'n', 3555, 'H'], ['o', 'C', 5953, '1961', '5671', '4207', '453', 'F', 'd', '1975', 'X', 'a', 9453]