In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['R', 'k', '1609', '1235', '1519', 'U', '1825', 'i', '4177', 'y', 1479, 'W', 'n', 'E', 5303, 8999], ['b', 6509, 8395, 'd', 'I', '1609', '1235', '1519', 'U', '1825', 'i', '4177', 'I', 'y', 't']