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:
[9119, 'k', 'K', 'R', '6039', 'K', 'f', '7929', 'S', 7321], ['U', 'S', 'I', 'L', '6039', 'K', 'f', '7929', 'C', 'J']
Answer:
6039, K, f, 7929