In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['j', 't', 5285, 'g', 9969, 'd', 8155, 619, 2049, '4007', '5887', 'H', 'd', '3235', 'N', 'G', '3433', '2161', 'H', 'H', '9715', '2207', '1793', '2505', 'W', '3845', '5117', 'c', 'P', 'F', 'U', 'x'], [4621, 8967, 335, 'J', 3595, 's', 7991, 'j', 'I', 1309, 'P', 'r', 2093, 6681, 817, 2465, '4007', '5887', 'H', 'd', '3235', 'N', 'G', '3433', '2161', 'H', 'H', '9715', '2207', '1793', '2505', 'W', '3845', '5117', 'N', 'f', 'o', 3045, 't', 'U', 8529, 2421, 4537, 507, 'a', 's']