In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[2211, 'a', 'U', 6821, 'l', '3301', 'm', 'V', '3211', '4577', 'k', '5615', 'I', 'l', '6921', 'A', 'c', 'b', 'U', 4641], ['p', 7031, '3301', 'm', 'V', '3211', '4577', 'k', '5615', 'I', 'l', '6921', 'V', 'c', 'T']