In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['l', 5091, 543, 'k', 'v', 'C', '4019', '7867', 't', '8213', 'P', 1053], ['S', 'X', 6581, 'y', 'p', 'C', '4019', '7867', 't', '8213', 'H', 'W', 7051]