In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[9427, 5577, 2089, 'd', 6859, 'y', '4761', 'k', '9591', '8913', 'x', 'f', 'C', '2929', '5699', '3467', 'H', '887', 'F', '121', 'N', 'j', 2469, 'A', 4195], ['L', 4221, 't', 'y', '4761', 'k', '9591', '8913', 'x', 'f', 'C', '2929', '5699', '3467', 'H', '887', 'F', '121', 'Y', 799, 5337, 'B', 'H', 'o', 8585]