In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[7903, 7617, 'V', 'j', 4167, 'Y', 4917, 'j', 5291, 'w', 'y', 'm', 619, 'a', 'A', 'Z', 'T', 'M', '3489', '6277', '1873', 'G', 'm', 'm', 'l', 'w', '5841', 'D', '5477', 'X', '4805', 'T', 'W', '239', '8781', '357', 'i', 't', 'M', '1915', 'x', 'C', 'k', 'g', 'i'], [9909, 3485, 't', 2841, 'R', 'M', 5911, 'a', 5997, 'H', 'u', 'Z', 'T', 'M', '3489', '6277', '1873', 'G', 'm', 'm', 'l', 'w', '5841', 'D', '5477', 'X', '4805', 'T', 'W', '239', '8781', '357', 'i', 't', 'M', '1915', 'x', 'C', 'i', 4071, 'g', 557, 1471, 4591, 5457, 'f', 2367, 'w', 5585, 'E', 'Y', 'v', 'z', 'P', 995, 4645, 3941, 's', 'B', 's']