In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[143, 6271, 5407, 4869, 1479, 'c', 9137, 'd', 'x', 'e', 'v', 7575, 'R', 697, 'e', 'E', 1425, 4029, 'H', 'H', 9703, 6421, 1449, '707', '9147', '2749', 'Z', 'H', 'f', '6323', '8159', 'w', '1829', '5143', 'y', '2331', '1557', '3391', '2963', 'o', 's', '2949', 'q', '2615', 'k', 'R', 'k', '9011', 'W', 'S', 'Y', 'R', 'a', 'd', 4521, 5243, 9355], [8473, 'k', 4981, 'I', 6805, 'a', 9535, 2665, 5005, 'n', 'C', 'W', 9427, 'j', 3163, 6425, 4745, 'F', '707', '9147', '2749', 'Z', 'H', 'f', '6323', '8159', 'w', '1829', '5143', 'y', '2331', '1557', '3391', '2963', 'o', 's', '2949', 'q', '2615', 'k', 'R', 'k', '9011', 'I', 5799, 3625, 4293, 7567, 'p', 'U', 4181, 7823, 285, 'K', 'J', 4313, 'Y', 'y', 'h', 'p', 'J']