In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[1465, 4581, 'd', 'y', 6291, '2611', 'f', '8269', 'u', 'M', '3915', '4447', 'Z', 'k', '603', '923', 'F', 'O', 'G', 'y', 'L', 'y', 'r', 'u', 'm', 1817, 'P', 'l', 'r', 't', 'T', 'C', 'X', 297, 429, 5985, 8085, 1747], [6663, 7171, 'h', 'x', 3797, 4525, 'v', '2611', 'f', '8269', 'u', 'M', '3915', '4447', 'Z', 'k', '603', '923', 'F', 'O', 'G', 'y', 'L', 'y', 'U', 'O', 8607]