In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['R', 1915, 'u', 3513, 'l', '4297', 'z', 't', '9285', '4957', '9967', 'g', 'n', 8751], ['d', 9673, 'U', 2667, 9623, 'd', 5711, '4297', 'z', 't', '9285', '4957', '9967', 'g', 'l', 325, 'k', 'q', 'Q', 6985]