In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[4473, 'Z', 'z', 3953, 't', 3021, 5245, 'k', 5003, 2747, 4839, 's', 4017, 'p', 'Y', 'U', '381', '9765', 'e', 'A', '457', '6095', '9367', '8451', 'J', '3237', '9989', 'x', 'X', '7747', 's', 'n', '3385', 'x', '2071', 'q', 'b', 7913, 5361, 5447, 8023, 'F', 33, 'i', 7717, 5225, 6073], [4345, 'H', 'Z', 7939, 'M', 803, 7985, 3137, 1831, 't', 'm', 'x', 3391, 7749, 'W', 'y', 'U', '381', '9765', 'e', 'A', '457', '6095', '9367', '8451', 'J', '3237', '9989', 'x', 'X', '7747', 's', 'n', '3385', 'x', '2071', 'w', 'n', 'O', 2901, 'g', 3869, 'y', 5541, 2689, 1299, 4195, 'I', 6393, 1453, 'P', 'O', 1999, 1577]