In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[1243, 'T', 'r', 'S', 'U', 'g', '6995', '6511', 'v', '9853', '9685', 't', '4283', 'i', 7373, 6897, 4511, 633], ['l', 9883, 's', 'f', 'N', 'H', 'U', 8255, 'g', '6995', '6511', 'v', '9853', '9685', 't', '4283', 'H', 'H', 'T', 4953, 'l', 6493, 8635]