In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[6207, 8551, 'O', 'K', 'G', 'K', '3853', 'K', '6381', '3159', '7585', '3613', 'k', '3581', 'C', 6643, 9171, 6253], ['M', 'v', 7253, 'K', 1059, '3853', 'K', '6381', '3159', '7585', '3613', 'k', '3581', 'U', 'j', 'W', 3929, 7195, 's', 'm', 5547]