In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['L', 3871, '3809', '3127', '2479', '8183', 'D', '8263', 'U', 'i', 'p', 'n', 1901, 'O', 7669], ['h', 'U', '3809', '3127', '2479', '8183', 'D', '8263', 'U', 'V', 'x', 7305]