In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['b', 6785, 't', 'K', 'V', 't', 'L', '855', '881', '6639', '1571', '1027', '8121', 'c', 'K', 'P', '8213', '9377', '2697', '7817', '1715', '911', 'a', 8693, 'A', 'E', 'T', 'Q', 'c', 't', 5405, 'd', 8785, 2703, 'D', 'b', 2965, 4097], ['t', 841, 'c', 6669, 4785, 'u', 'A', 1139, 'X', 'X', 'p', 3085, 't', 'L', '855', '881', '6639', '1571', '1027', '8121', 'c', 'K', 'P', '8213', '9377', '2697', '7817', '1715', '911', 'U', 5917, 'b', 'x']