In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[9257, 'Y', 'z', '7721', 'k', '7763', 'V', 'B', 'B', 'O'], ['e', 'Y', 'c', 'u', '7721', 'k', '7763', 'V', 'w', 'n', 1803]