In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['W', 8227, 'c', 9521, 79, 'd', 'Y', '6849', '4287', 'o', '5909', '565', '8323', '1159', '1281', '6181', 'n', 1683, 'G'], [2131, 'v', 4559, 's', 's', 5659, 7869, 8853, 'Y', '6849', '4287', 'o', '5909', '565', '8323', '1159', '1281', '6181', 'H', 'I', 'a', 1855, 8511, 781, 9529]