In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
One example is below.
Q: [5797, 8817, '8297', 'b', 'U', 'b'], [5843, 8809, '8297', 'b', 'W', 'C']
A: 8297, b
Rationale: 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'].
Q: ['M', 'o', 2169, 'n', 8631, 2853, 8187, 'H', 's', 6417, 'n', '4665', '2865', '5293', '5871', '983', '3309', '1921', 'g', 'Z', 'x', 'x', 'Y', 3745, 1485, 3741], [9743, 'E', '4665', '2865', '5293', '5871', '983', '3309', '1921', 'g', 'Z', 'x', 'x', 'x', 'W', 841, 'o', 'b', 9971, 2807, 'F', 'j', 4783, 'M']
A:

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
4665, 2865, 5293, 5871, 983, 3309, 1921, g, Z, x, x