In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[4351, 'Z', 439, 2709, 'r', 7921, '7079', 'T', '5009', 'a', 'r', 'Z', '2345', '1649', '7689', '8395', '731', 'R', 't', 'E', 6035, 'q', 5973, 7121], ['m', 3671, 1589, 'x', 'b', 'n', 8179, 'I', '7079', 'T', '5009', 'a', 'r', 'Z', '2345', '1649', '7689', '8395', '731', 'R', 't', 'V', 'k', 8373, 'O', 'c', 's', 6669]