In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['H', 'I', 7219, 4647, 'h', 9515, 'x', 'k', 6703, 't', 'D', '9537', 'F', '15', 'q', 'x', '8319', '4981', '6187', '511', '4079', 'm', 'i', 7617, 'o', 'd', 2715, 'U'], [1005, 'X', 23, 8153, 'K', 'C', 1027, 'D', '9537', 'F', '15', 'q', 'x', '8319', '4981', '6187', '511', '4079', 'm', 'b', 'G', 'U', 2123, 'x', 3655, 'm']