In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['k', 6755, 6887, 'e', 'w', 'f', 'k', 2031, 'O', 7709, 'W', '5655', '1161', 'm', 'Y', '9551', '4657', '6321', '3717', 'L', 'd', 'P', '2121', 'b', '6415', 'y', '9675', 'z', 'x', 'S', '9055', 'g', 6727, 'v', 739, 'n', 'E', 2165, 7609, 5465, 3247, 'P'], [6931, 'r', 175, 3911, 3669, 'W', 'X', 'f', 6807, 6667, 371, 7655, 3289, 'h', 'E', 9495, 'W', '5655', '1161', 'm', 'Y', '9551', '4657', '6321', '3717', 'L', 'd', 'P', '2121', 'b', '6415', 'y', '9675', 'z', 'x', 'S', '9055', 'i', 'M', 'p', 973, 4561, 'k', 'j', 'x', 'y', 'C', 1179, 2279, 's', 'V', 's', 6583, 'V', 6081, 'C', 7059, 'k']