In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['V', 3407, 'b', 'Z', '3173', '3669', 'j', 'j', 'A', '9039', 'W', 'U', 't', 2779, 1241, 'S', 7555], ['E', 'E', 4499, '3173', '3669', 'j', 'j', 'A', '9039', 'W', 'c', 4241, 'B', 'r']