In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[7655, 7479, 'K', 'h', 3253, 2529, 'u', 7893, '8247', 'S', 'I', '1585', 'F', '9021', 'A', '5169', '8307', '8569', 'K', 'd', '6921', 'c', '5653', 'S', '7909', 'R', 5329, 'A', 'w'], ['y', 'S', 'L', 'S', '8247', 'S', 'I', '1585', 'F', '9021', 'A', '5169', '8307', '8569', 'K', 'd', '6921', 'c', '5653', 'S', '7909', 'i', 'v', 'X', 'e', 9645]