In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[6673, 2611, 515, 'C', '9673', 'y', '7935', '11', '2767', '8649', 'o', 'X', '5201', 'C', 'y', 'W', '7111', '1203', '1679', '9667', '5509', 'r', '5519', '5451', 'D', 'J', 5859, 'A', 5007, 'Z', 2569, 'q', 'a', 'C', 'J', 3239, 'c', 'z', 'q', 'X', 1845, 8741], [2099, 'l', 7957, 'C', '9673', 'y', '7935', '11', '2767', '8649', 'o', 'X', '5201', 'C', 'y', 'W', '7111', '1203', '1679', '9667', '5509', 'r', '5519', '5451', 'D', 'L', 4035, 'a', 2497, 9111]