In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[1709, 8441, 239, 'l', 'k', 'G', 1871, 6633, 129, 329, 'e', 'D', 5021, 'H', 'M', 'O', 'M', 'L', 'N', 'a', '3847', 'h', 'Y', '3907', 'x', 'd', '9915', '7437', '4661', '741', 'V', 'j', 'Z', '6351', '5559', 'o', '5711', '7349', '8647', '2755', 'Z', 'Y', 'V', 'W', 1071, 2703, 8975, 3907, 'g'], [3679, 't', 1463, 8127, 'f', 'M', 3265, 'v', 'h', 'L', 1905, 'E', 'j', 'y', 't', 2523, 1963, 'B', '3847', 'h', 'Y', '3907', 'x', 'd', '9915', '7437', '4661', '741', 'V', 'j', 'Z', '6351', '5559', 'o', '5711', '7349', '8647', '2755', 'n', 'H', 'k', 7603, 5473]