In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['k', 'x', 'T', 3671, 'l', '1495', '7199', '1637', 'p', '4437', 'P', 'y'], ['O', 'j', 3313, 3635, 6607, '1495', '7199', '1637', 'p', '4437', 'H', 'l', 6199, 483]