In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.

[6507, 8623, 6879, '1327', '6971', 'd', 'A', 3663, 7831], [1711, 4751, 3479, '1327', '6971', 'd', 'u', 1771]
1327, 6971, d

[2687, 7971, 2141, 'X', 'z', 1281, 'K', 6109, 7773, 'P', 5247, 'j', 'K', 5225, 'c', 4401, 'Z', 'j', 'Y', '4799', 'h', '5519', 'n', '3231', 'l', '3003', 'F', '5599', 'J', 'q', 'r', '889', 'e', '9805', 'X', 'B', 'k', 4913, 5483, 1465, 'F', 9669, 'i', 'L', 'q', 'n'], ['k', 'g', 'e', 'I', 'v', 97, 'N', 'j', 'Y', '4799', 'h', '5519', 'n', '3231', 'l', '3003', 'F', '5599', 'J', 'q', 'r', '889', 'e', '9805', 'X', 'H', 7153, 7967, 'u', 7859, 1387, 7361]
j, Y, 4799, h, 5519, n, 3231, l, 3003, F, 5599, J, q, r, 889, e, 9805, X

['s', 'n', 'n', 'f', '4269', 'f', 5959], ['C', 'j', 'n', 'f', '4269', 'g', 'E']

n, f, 4269