Detailed Instructions: In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
Q: ['W', 'N', 5007, 'x', '6819', '5579', 'l', 'z', 'd', 'c', 2657, 'y'], [4057, 6267, 'r', '6819', '5579', 'l', 'z', 'Y', 821]
A:
6819, 5579, l, z