In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['R', 6019, 'K', 'E', 9521, '9651', '2611', 'e', 'o', '2975', 'S', 't', 5709, 'I', 7589, 4653], [1273, 'U', 'W', 'O', 'y', 'l', '9651', '2611', 'e', 'o', '2975', 'S', 'y', 2585]