In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['l', 'd', 'B', 'H', '3957', '4097', '4137', 'Z', '873', '243', '741', 'p', 'h', 'X', '3561', 'o', 'Z', 'i', 7685, 9915, 'n', 'Q'], [9985, 6069, 1255, 5287, 2823, 'k', 'M', 1797, 6871, '3957', '4097', '4137', 'Z', '873', '243', '741', 'p', 'h', 'X', '3561', 'l', 2067, 2913, 75, 3967]