In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['v', 'J', 'H', 'o', 'M', 2827, 5819, 989, '8781', 'M', 'B', 't', '2649', '4871', '3555', 'J', 'T', 'b'], ['M', 'c', 4717, '8781', 'M', 'B', 't', '2649', '4871', '3555', 'J', 'y', 'B', 4655, 'C', 9901, 1831, 4377]