In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[2079, 'I', 's', 'l', '939', 'k', 'C', '1219', 'e', 'F', 'p', 4231], ['c', 'p', 'k', 443, 'c', '939', 'k', 'C', '1219', 'e', 'L', 4877, 393]