In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['U', 't', 'C', '9659', '1421', '7821', '4271', 'K', '8197', 'v', 'k', 9969], [1583, 5493, 7423, 1445, 'B', 8161, 'C', '9659', '1421', '7821', '4271', 'K', '8197', 'd', 'v', 4099, 5905, 4147, 6651]