In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[5475, 'J', 'M', 'V', '7693', 'D', 'x', 'c', 2053, 7121, 'O'], [4761, 'u', 'V', '7693', 'D', 'x', 'k', 'r', 'I']