In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[4307, 3015, 'y', '9841', 'K', 'f', 'H', 'X', '7199', 'B', '3951', '6201', '8699', 'b', 'R', '5473', 'P', 'o', '7167', 'C', '6067', 'e', 9645, 'k', 'P', 'v', 6781, 8993, 6115, 'S', 6367, 6813, 'O', 'T'], [8421, 7107, 2019, 'u', 6501, 'F', '9841', 'K', 'f', 'H', 'X', '7199', 'B', '3951', '6201', '8699', 'b', 'R', '5473', 'P', 'o', '7167', 'C', '6067', 'y', 8469, 'm', 9285, 's', 'V', 9025, 8801, 'v', 5827, 'C', 'L', 'L', 75, 'a', 'v']