In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['L', 1653, 4833, 3597, 'B', 'A', 'g', '6735', '6737', '6929', '3051', 'v', '1223', '497', 'K', 4721, 'L', 'H', 'F', 'y', 2849], [9635, 3451, 'A', 'g', '6735', '6737', '6929', '3051', 'v', '1223', '497', 'd', 'f']