In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[1509, 6907, 'J', 1991, 'Z', 'D', 4817, 5427, 'T', '6293', 'D', 'q', 'R', '4255', '3641', 'f', 'C', '7351', '157', 'e', 'S', '5679', 'z', 't', '7335', '6727', 'F', 'f', 'k', 'e', 6845, 2991, 'C', 'M', 'd', 'M', 'k', 'C', 1251, 2635, 9301, 'G', 4079], ['l', 'I', 'T', '6293', 'D', 'q', 'R', '4255', '3641', 'f', 'C', '7351', '157', 'e', 'S', '5679', 'z', 't', '7335', '6727', 'p', 'V', 'C', 'z', 'L', 'S', 115, 5241, 10019, 6763]