In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[9003, 3639, 'C', 3471, 'p', 'R', '2833', '755', 'o', 'l', '5551', '1141', 'u', '5887', 'p', 'O'], [7963, 8257, 6997, 9187, 1581, 8737, 'X', 1829, 'R', '2833', '755', 'o', 'l', '5551', '1141', 'u', '5887', 'o', 2927, 3975, 'F', 'm', 'W', 5897, 'n']