In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['H', 'J', 7097, 3985, '6083', '9505', 'y', '7911', 'k', 'j', 'u', 5301, 10029, 'I', 4115], [2753, 'X', '6083', '9505', 'y', '7911', 'k', 'j', 'I', 7241, 9777]