In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[7703, 6217, 'O', '6147', '3283', 'x', '4941', 'U', 'w', 9083, 't'], ['L', 3775, '6147', '3283', 'x', '4941', 'R', 'o']