In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[273, 'i', 4051, 9063, 'D', 'E', 5087, 'M', '9959', '6273', 'p', 'L', 'B', 'H', '7889', '9933', 'p', '519', '339', 'h', 'u', 5559, 1733, 9555], ['i', 5977, 'r', 'b', 589, '9959', '6273', 'p', 'L', 'B', 'H', '7889', '9933', 'p', '519', '339', 'n', 'y', 'q']