In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[675, 'O', 'Q', 'r', 6917, 'M', '7723', '921', '33', 'U', 'S', '3705', 'F', 'b', 'S', 'P', 'j'], [8723, 7223, 3401, 5407, 2415, 1897, 'K', 9025, 6233, 'M', '7723', '921', '33', 'U', 'S', '3705', 'F', 'b', 'R', 'j', 4859]