In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[3979, 'j', 6383, 'd', 3147, 6859, '3131', 'R', 'G', 'D', 'P', '6445', 'C', 'i', 'T', 'L', 6969], [9479, 6441, '3131', 'R', 'G', 'D', 'P', '6445', 'L', 1703, 9669]