In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['d', 'I', 'C', '4669', 'C', '7143', 'O', 7483, 'C', 7647], [5057, 2391, 2633, 'C', '4669', 'C', '7143', 'v', 'D', 2609, 1903]