In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['x', 9693, 5733, 6629, '3239', '7349', '3201', '6589', 'n', 'j', 'w', 8993, 8401, 'n'], ['e', 'i', 605, '3239', '7349', '3201', '6589', 'n', 'R', 'W', 6857]