In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['j', 2707, 9257, 5151, 8501, 7889, '4705', 'q', 'M', 'Z', 'r', '4823', 'K', '6377', '4313', '7799', 't', '5883', 'a', 2853, 'e'], ['X', 8745, 7041, 8389, 5423, 9437, 5707, 4639, '4705', 'q', 'M', 'Z', 'r', '4823', 'K', '6377', '4313', '7799', 't', '5883', 'R', 'Y', 'b', 'Z', 'b']