In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[7979, 'F', 'D', 1761, 'y', 4029, 3075, 's', 'U', '7645', '1461', 'G', 'X', '729', 'u', 2759], ['c', 'J', 'V', 7005, 's', 'U', '7645', '1461', 'G', 'X', '729', 'C', 2141, 'S', 3123]