In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[2607, 5321, 7279, 4483, 'r', 9139, '8727', 'E', '3941', 'b', 'u', '1483', 'Y', '8703', '2721', '9339', 'x', 'u', 'J', 'z', 'H', 'P', '9997', 'j', 'g', 6623, 959, 7707, 7227, 'Q', 'g', 4839, 'Q', 'C', 'B', 'u', 'H', 'H'], [6499, 5225, 'w', 'k', 'B', 5947, 'L', 'd', 8629, '8727', 'E', '3941', 'b', 'u', '1483', 'Y', '8703', '2721', '9339', 'x', 'u', 'J', 'z', 'H', 'P', '9997', 'j', 'w', 3187, 2633, 'M', 'd', 4745]