In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['W', 's', 'o', '8453', '5137', 'e', '7759', 'g', 'j', 'l', 8125, 'l', 'k'], [3571, 7445, 'P', 6845, 7373, '8453', '5137', 'e', '7759', 'g', 'b', 2295, 4161, 9771]