In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['j', 8349, 'I', 'O', 'R', 'u', 'Y', '7519', 'u', 'T', '6769', 'x', '4729', '6667', '819', 'W', 'D', 8389, 's', 3501, 7619], [1783, 1693, 'g', 'R', 'u', 'Y', '7519', 'u', 'T', '6769', 'x', '4729', '6667', '819', 'W', 'y', 'L', 'w', 9759]