In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['X', 'W', 'w', 3315, 'j', 7487, 'O', 't', '3433', '9323', 'u', '3441', 'z', '6947', '725', '1163', 'Z', '4173', 'q', 'X', 'i', 7659, 6597, 'C'], [7687, 'F', 'f', 'c', 'C', 'h', 235, 'h', 't', '3433', '9323', 'u', '3441', 'z', '6947', '725', '1163', 'Z', '4173', 'V', 2705, 'a', 'B', 1841]