In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['O', 2475, 'e', 8241, 4485, 7727, 'B', 'k', 5703, '1503', 'B', '9321', '9407', '1559', '9345', '305', '6393', 'A', '6699', 'c', 'Q', 'U'], ['b', 4087, 'K', 'B', 5027, '1503', 'B', '9321', '9407', '1559', '9345', '305', '6393', 'A', '6699', 'p', 311, 2931, 9847, 'K', 'R', 927, 'g']