In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[7957, 2721, 'P', 'm', 5049, 8827, 'W', 'M', 'r', '2759', '6035', 'f', '6783', '5285', '753', 'd', '9047', 't', 's', 'R', 'p', '4499', '8015', 'd', 'e', 'X', 3393, 8985, 4315, 3095, 's', 'k', 'q', 'i', 5373], [7387, 8371, 1117, 'M', 'r', '2759', '6035', 'f', '6783', '5285', '753', 'd', '9047', 't', 's', 'R', 'p', '4499', '8015', 'I', 7065, 'x', 3945, 'Y', 'n', 5743, 321, 'F']