In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['P', 761, 'o', 'i', 'e', 'n', 'J', 'C', '3505', 'h', '5399', 'L', '4621', '6999', '7181', '2779', '2415', 'I', '2777', '1249', 'D', '8553', 'n', 'T', 'k', 'M', 'i', 'U', 'p', 5331, 'c', 1665, 6141], ['k', 'G', 1931, 'E', 1283, '3505', 'h', '5399', 'L', '4621', '6999', '7181', '2779', '2415', 'I', '2777', '1249', 'D', '8553', 'n', 'j', 's', 7011, 'x', 4107, 3425, 'N', 'N', 4145, 2925]