In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['t', 'V', 4473, 6953, 'x', 'e', 9129, 6903, '5343', 'x', '6761', '9005', '2753', 'B', 'J', '117', 'H', 'C', 'c'], [3945, 845, 'A', 6703, 3523, 'I', '5343', 'x', '6761', '9005', '2753', 'B', 'J', '117', 'i', 'z']