Teacher: In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
Teacher: Now, understand the problem? If you are still confused, see the following example:
[5797, 8817, '8297', 'b', 'U', 'b'], [5843, 8809, '8297', 'b', 'W', 'C']
Solution: 8297, b
Reason: 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'].

Now, solve this instance: [4389, 4149, 2537, 7061, '8213', '5373', '611', '4237', 'X', 'W', 'l', 'x', 5321, 4091], ['z', 4749, 2781, 'g', 'l', '8213', '5373', '611', '4237', 'X', 'h', 'z', 'A']
Student:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
8213, 5373, 611, 4237, X