In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['W', 5963, 'L', '219', '7845', '8151', '5843', '93', '7485', 'T', 'W', 'a', '9647', '2933', 'S', '5853', 'P', 'b'], ['i', 2721, 'm', 'e', 'L', '219', '7845', '8151', '5843', '93', '7485', 'T', 'W', 'a', '9647', '2933', 'S', '5853', 'C', 1811, 'S']