In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['G', 319, 6723, 'f', 1019, 3753, 'f', '7799', '2717', '4155', 'X', '4121', '1607', '415', '3577', '2827', 'N', 't', 'G', 'l', 'y', 'm', 'O'], [6611, 'u', 603, 'G', 9487, 'Y', 6239, '7799', '2717', '4155', 'X', '4121', '1607', '415', '3577', '2827', 'N', 'f', 'I', 4667, 3473, 2469, 'V', 5157, 5191]