In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['O', 9613, 'i', '4915', 'b', '9121', 'd', 'v', 'e', 1751, 'R'], [1891, 'u', '4915', 'b', '9121', 'd', 'K', 'C', 9519]