In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['A', 'K', 7009, 'x', 'p', 'F', 7427, 'E', 8553, 'P', 's', 'k', '5309', 'S', 'P', '7473', 'k', 'P', 'W', '9285', 'l', 'B', 'J', '8961', '4927', 'R', 'e', 'l', 4619, 'C', 9931, 7621, 'd', 321, 'x', 8321, 'E', 2419, 2797], [901, 2099, 8627, 'N', 'N', 'Q', 'g', 5213, 's', 'k', '5309', 'S', 'P', '7473', 'k', 'P', 'W', '9285', 'l', 'B', 'J', '8961', '4927', 'j', 3747, 'j', 'U', 'D', 'j', 'p', 1841, 7495]