In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['H', 3757, 'h', 'H', '5945', '4667', '7835', '1235', '5643', '7251', '5007', '4427', '2345', 'R', 'P', '8039', 'd', 'n', 'L', 'E', 459], [9219, 755, 'O', 'h', 'H', '5945', '4667', '7835', '1235', '5643', '7251', '5007', '4427', '2345', 'R', 'P', '8039', 'd', 'D', 8991, 'L']