In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[2403, 1927, 6845, 'c', 463, 'U', 'W', 'N', '761', '4729', '6595', 'v', 'B', '4273', '6837', 'j', 'w', '4735', '3409', 'b', 'Y', 'x', 7459, 't'], ['B', 2065, 121, 'W', 'p', 5519, 7831, '761', '4729', '6595', 'v', 'B', '4273', '6837', 'j', 'w', '4735', '3409', 'N', 185]