In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['W', 'd', 6601, 8921, '3291', '8673', '2893', '4911', '9267', 'Q', '8287', 'L', 2417, 2975, 9279], ['X', 'R', 'K', 'w', 497, 3615, 'I', '3291', '8673', '2893', '4911', '9267', 'Q', '8287', 'K', 'N']