In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[9711, 6103, 3531, 3623, 'u', '6995', 'R', 'p', 'p', 'p', '8519', '4447', 'b', 6001, 'b', 2477, 'd', 'y', 'C', 9605], ['j', 'P', 'W', 9073, 'u', '6995', 'R', 'p', 'p', 'p', '8519', '4447', 'X', 8365, 9899, 'H', 'T', 4049, 'Z', 'w']