In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.

Let me give you an example: [5797, 8817, '8297', 'b', 'U', 'b'], [5843, 8809, '8297', 'b', 'W', 'C']
The answer to this example can be: 8297, b
Here is why: Here, '8297, b' is the longest common subsequence in both the input lists [5797, 8817, '8297', 'b', 'U', 'b'] and [5843, 8809, '8297', 'b', 'W', 'C'].

OK. solve this:
[6577, 'd', 'i', 'r', 'I', '6459', 'W', 'n', 'u', '91', 'p', 7921, 'e', 9517, 1753, 'L'], [3367, 1963, 'q', 'S', 1969, 5419, 'o', 'r', 'I', '6459', 'W', 'n', 'u', '91', 't', 9891, 'Y', 'J', 'S', 'E']
Answer:
r, I, 6459, W, n, u, 91