In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['B', 'R', 'J', 'x', 'F', 'f', 'w', 'u', '8647', 'M', '1939', 'Y', 'u', '5453', 'd', '8189', 'S', 7449, 2533, 2645, 'i', 8383, 'U', 'B', 9505, 561, 6425], [2851, 3763, 7769, 2775, 'F', 'f', 'w', 'u', '8647', 'M', '1939', 'Y', 'u', '5453', 'd', '8189', 'v', 7119, 'Y']