In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[6977, 1525, 441, 'm', 'a', 'v', 7175, 'e', 'q', 'a', 'C', 8421, 4381, 111, 9681, '9449', 'D', 'J', '9657', '2013', 'S', '9609', '8705', 'e', 'u', 'D', 'B', 'c', 'u', 's', '2421', '8035', '5893', 'l', '10021', 'a', '6857', '5055', 'f', 'B', 'u', 'R', 'r', 'd'], [4181, 8575, 4799, 'b', 9039, '9449', 'D', 'J', '9657', '2013', 'S', '9609', '8705', 'e', 'u', 'D', 'B', 'c', 'u', 's', '2421', '8035', '5893', 'l', '10021', 'a', '6857', '5055', 'f', 'B', 'u', 't', 9403, 'Q', 1753, 'h', 'R', 'z', 2395, 'P', 'b', 'j', 'J', 'I', 's', 8113, 4717, 797, 1891, 9113, 1543, 5271, 5225, 9199, 'a', 2695]