In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['C', 'F', 8875, 9185, 3971, 'q', 'n', 'I', '7919', '2115', 'x', '5987', 'u', 1455], ['p', 8603, 'n', 'I', '7919', '2115', 'x', '5987', 'R', 3859, 1871, 'q', 'O', 'u']