In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['W', 'O', 'q', 'i', 'Z', '5647', '5501', 'u', 'j', '6951', 'M', 'v', 2919, 'O', 3681], ['b', 4387, 'U', 3983, 369, '5647', '5501', 'u', 'j', '6951', 'm', 'Z', 'o', 7645]