In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[6957, 'y', 9941, 2831, 3223, 'y', 'v', 'N', '7647', 'x', '7915', 't', 'A', '5851', '9193', 'k', '3381', 'Q', 'g', 6719], ['m', 3069, 'j', 2661, 's', 'v', 'N', '7647', 'x', '7915', 't', 'A', '5851', '9193', 'k', '3381', 'R', 'X', 6725, 6245]