In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[2137, 6679, 5959, 'b', '6693', '1435', '4727', '105', 'g', 'n', 'r', 'l', '657', '3423', '2859', 'K', 'E', '9307', '4809', 'n', 'J', '7133', 'l', 'Y', 'i', 'y', 'y', 'L', 'I', 'a', 1223, 2437, 5429, 4349, 2015, 4833, 'q', 'W', 1633, 3009, 5887, 2649, 'R', 4125, 1661, 'l', 9685, 'W'], ['L', 2167, 'e', 'T', 'U', 'b', '6693', '1435', '4727', '105', 'g', 'n', 'r', 'l', '657', '3423', '2859', 'K', 'E', '9307', '4809', 'n', 'J', '7133', 'l', 'Y', 'i', 'y', 'y', 'L', 'Y', 9239, 'S', 'T', 'd', 1793, 'A', 4833, 'h', 'e', 'i', 7473, 'H']