In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['B', 'W', 'i', '4517', '9199', '3763', 'T', '6657', '3011', 'o', 785, 2353, 'P', 7143], ['i', 5833, 8555, 'r', 'g', '4517', '9199', '3763', 'T', '6657', '3011', 'I', 275, 'N', 'H']