In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[2139, 'L', 487, 2599, 333, 5999, 9999, 3601, '1783', '10021', '8017', '10017', '6865', 'a', '3883', '1661', '4361', '9107', '1501', 'W', '5907', 'o', '5465', 'W', 'g', 'x', 4363, 6035, 7915, 'u', 8907, 7559, 'X', 'B'], ['I', 'V', '1783', '10021', '8017', '10017', '6865', 'a', '3883', '1661', '4361', '9107', '1501', 'W', '5907', 'o', '5465', 'W', 'L', 2535, 'H', 7715, 5219, 9321, 'G', 1547, 'V']