In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[2843, 5183, 5995, 'K', 'u', 1335, '7277', '4825', '5063', 'X', 'C', 'm', '6991', '6373', '4743', 's', '7575', '5075', 'f', 'w', '8157', 'U', 'g', 'o', 'l', 9853], [9653, 'o', 'g', 7393, 'u', '7277', '4825', '5063', 'X', 'C', 'm', '6991', '6373', '4743', 's', '7575', '5075', 'f', 'w', '8157', 'U', 'W', 4831, 8431, 'P', 'x', 2421, 6635]