In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['K', 3681, 9449, '609', 'f', 's', 'E', '9947', '2777', 'g', 2423, 'P', 1779, 'Q'], ['R', 'B', 'q', 9469, '609', 'f', 's', 'E', '9947', '2777', 'K', 7551, 6873, 'g', 1347, 5527]