In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[1963, 'g', 7961, 'X', 2141, 6591, 9869, '7203', '923', '6887', 'b', 'm', '3403', 'M', '3115', 'Y', 'E', '2673', 'N', 'b', 'P', 3227, 'N', 1469, 'Q', 'i', 'd', 't', 7749, 'S', 4397], [9055, 'E', 'l', 'V', 'i', 5923, 't', '7203', '923', '6887', 'b', 'm', '3403', 'M', '3115', 'Y', 'E', '2673', 'N', 'b', 'V', 'N', 'k', 8489, 4491]