In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['M', 'J', 779, 'G', 'l', '1633', '5391', 'P', 't', 'V', '4335', 'a', 'm', 'C', 'u', 'n', 'R', 'U', 'p', 'H', 7079], ['s', 7393, 7397, 4627, 3665, 'U', 'P', '1633', '5391', 'P', 't', 'V', '4335', 'a', 'm', 'C', 'u', 'n', 'R', 'U', 'p', 'E', 9401, 'j', 5755, 5439, 1257, 'X', 1073, 'l', 's', 4361, 'r', 7697, 'x']