In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['F', 'D', 'K', '7869', 'A', '8019', 'G', '9937', '7543', 'h', '833', '7421', 'x', '3991', 'l', '4321', 'Y', 8517, 'o', 6627, 5649, 'e'], ['H', 2969, 2137, 7779, 8497, 'W', 'Z', 'A', 'q', 9401, 'K', 'O', 'U', '7869', 'A', '8019', 'G', '9937', '7543', 'h', '833', '7421', 'x', '3991', 'l', '4321', 'T', 7095, 'd', 6019, 9093, 9737, 'R', 'w', 5111, 'T', 'A', 1481]