In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[1897, 2233, 7643, 9917, 6455, 'u', 4025, 8165, 941, 'W', 'q', 3109, 6535, 6381, 'd', 'F', '5071', '193', '2017', 'G', 'V', 'u', 'B', '877', '6981', 'W', 'f', 'K', 'g', 'D', 'J', '5351', '7169', 'I', 'X', 'C', '4357', '5033', 'p', '9357', '5173', 'f', 'L', 855, 'q', 'd', 'm', 1017, 'A', 97, 2111, 'b', 'f', 613, 4093, 't', 'Q', 3043, 'e', 9925, 9857, 't', 6199, 7313], ['d', 4833, 7355, 'k', 1443, 9197, 4605, 7821, 'D', 'F', '5071', '193', '2017', 'G', 'V', 'u', 'B', '877', '6981', 'W', 'f', 'K', 'g', 'D', 'J', '5351', '7169', 'I', 'X', 'C', '4357', '5033', 'p', '9357', '5173', 'f', 'W', 'i', 't', 'J', 'l', 3275, 8275, 'z', 8817, 'P', 'a', 7641]