In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[8523, 2741, 'B', 2283, 2319, 5579, 4895, 1093, '6081', 'w', 'j', 'U', '8951', 'g', '3325', '6587', '4979', 'X', 'x', '8257', 'G', 2491], [17, 6185, '6081', 'w', 'j', 'U', '8951', 'g', '3325', '6587', '4979', 'X', 'x', '8257', 'n', 4549, 'g', 1859, 'f', 'B', 4639, 6413]