In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[2009, 5723, 'u', '187', '9175', '1885', 'F', '6505', 'H', 9683], ['I', 1133, 'I', '187', '9175', '1885', 'F', '6505', 'C', 'h', 2645, 4459]