In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[6347, 5629, 6521, 'U', 3953, 'M', 'W', '1599', 'h', '2563', '529', '9467', 't', 'B', 'j'], ['k', 'p', 'W', '1599', 'h', '2563', '529', '9467', 't', 'y', 'o', 'R', 8443, 'R', 6017]