In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['N', 9925, 6613, 'v', 'U', '6887', '9329', 'H', 'x', 'W', '7967', 'R', 'G', 'R', 'E'], [1129, 8235, 'w', 1385, '6887', '9329', 'H', 'x', 'W', '7967', 'R', 'I', 7643, 'f']