In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[2451, 1761, '5143', 's', 'c', '73', '8657', '6255', 'T', 'W', 2419, 'Z', 'D', 7211, 2769], ['E', 'x', 8337, 'm', 'M', 'l', 's', '5143', 's', 'c', '73', '8657', '6255', 'T', 'J', 'R', 5541, 4921]