In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['p', 'W', 'a', 's', 'K', '6887', '2197', '7877', '5553', '1441', '6555', '5217', 'j', 'J', '8573', '779', '8367', '7157', '6105', '1107', '5429', 'A', 'D', 'k', '2107', '647', '6605', 'Q', 'R', 6973], [207, 4073, 'j', 'd', 'y', 6637, 9849, 3573, 4329, 'z', 6249, 'H', 3499, 673, 'I', 2929, 5043, 7603, 'a', 's', 'K', '6887', '2197', '7877', '5553', '1441', '6555', '5217', 'j', 'J', '8573', '779', '8367', '7157', '6105', '1107', '5429', 'A', 'D', 'k', '2107', '647', '6605', 'U', 'p', 'Q', 'a', 'w', 'n', 4869, 'Z', 9867, 'E', 2647, 4137, 'i', 2517, 5385, 6243, 1755, 'w']