In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[7181, 7391, 7801, 1885, '6203', 'k', '4059', '7603', '4509', 'b', '7261', '9131', '7873', '9501', 'g', 'x', 4015, 'v', 'l', 6731, 'U', 5937], ['J', 3065, 4029, 3255, '6203', 'k', '4059', '7603', '4509', 'b', '7261', '9131', '7873', '9501', 'g', 's', 'u', 3563, 6549, 2183, 'G', 'Z', 4803]