In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[9413, 2451, 'G', '5619', '7269', 'U', 'G', 'Y', '9941', '1219', 'O', '6139', 'R', 1947, 't', 277], [759, 4043, 'W', 9029, 'z', 'u', 471, 3117, 'G', '5619', '7269', 'U', 'G', 'Y', '9941', '1219', 'O', '6139', 'O', 'P', 'j', 'z']