In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[1575, 155, 2061, 'a', 'M', 'a', 1727, 9807, 'h', 'B', 3075, '807', 'W', 't', 'b', '6731', 'Q', '5615', '9321', '7657', '3759', 'F', '3955', 'Y', 'v', 9091, 'M', 1283, 3171, 9679], [2403, 8643, 'U', 3167, 'S', 3035, 9175, 'F', 'y', 4505, 1173, '807', 'W', 't', 'b', '6731', 'Q', '5615', '9321', '7657', '3759', 'F', '3955', 'Y', 'w', 2169, 'h', 3237, 'X']