In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['K', 'P', 3805, 'c', 3023, 1403, '9451', 'O', '5493', '9941', 't', 'B', '8875', '3415', 'M', 'T', '2381', '7899', 'u', 'l', 'O', 589, 'J', 6799, 'R', 8201, 9715, 9463, 'h', 'W', 'U', 4639, 2063], ['K', 'v', 'd', 6071, 'E', 'n', '9451', 'O', '5493', '9941', 't', 'B', '8875', '3415', 'M', 'T', '2381', '7899', 'u', 'l', 'I', 2795, 9967, 8591, 137, 2975, 'x', 'x', 3135]