In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[9963, 'u', 1251, 7521, 9021, 'y', 'u', 'a', 's', 'G', 'Q', '5915', 'v', '2845', 'd', '7093', 'y', 'z', '7593', 'z', 'e', 'x', 3531, 2755, 'H', 'A', 5171, 'e'], [5277, 'e', 1187, 2613, 3857, 'i', 6647, 'W', 8773, 'a', 's', 'G', 'Q', '5915', 'v', '2845', 'd', '7093', 'y', 'z', '7593', 'C', 'X', 3175, 'P']