In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['S', 'W', 'y', 'o', 'V', 'h', 'N', 'k', '6561', 'b', '3961', 'n', 'S', '6159', '6233', 'P', '4581', 'X', 'y', '7723', '7237', 'I', 'M', 'e', 'x', 'e', 'v', 'f', 3731], [7773, 7059, 5005, 5505, 9283, 7107, 'g', 'K', 7381, 'Q', '6561', 'b', '3961', 'n', 'S', '6159', '6233', 'P', '4581', 'X', 'y', '7723', '7237', 'I', 'M', 'e', 'x', 'e', 'v', 'i', 9321, 8209, 'B', 'H', 'k', 'g', 'K', 9507]