In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[5625, 6017, 'd', 'p', '4423', '77', 'E', '5271', 'A', 1553, 'c'], ['U', 1615, 'u', 'd', 'p', '4423', '77', 'E', '5271', 'x', 'w', 'Y']