In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[3399, 'j', 't', 7469, 'p', 'p', '6995', '2623', '39', '7019', 'n', 'U', 'M', 'D', 6825, 'X'], [9777, 'u', 9093, 'Q', 'e', 'p', '6995', '2623', '39', '7019', 'n', 'o', 9105, 'b', 'E']