In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['X', 4183, 241, 'u', 2643, 'l', 945, 2899, 7655, 2111, 'u', 'a', '9703', '2439', 'y', '6011', 'V', '1987', '1501', 'H', 'y', 'b', 'E', '5427', 'H', '1903', '6549', 'K', 'm', '4815', 'l', 'B', '2623', '4251', 'b', '173', 'B', 'F', 'b', 5415, 'P', 231, 'O', 1989, 3981, 'M', 335, 5993, 'Z', 3417, 'y', 2547, 'B', 'x', 99, 3833, 'c', 'J', 'K'], [3277, 'K', 'l', 2293, 3899, 'Z', 2573, 'E', 'R', 7605, 6299, 'C', 4099, 3957, 'p', 'z', 'u', 'a', '9703', '2439', 'y', '6011', 'V', '1987', '1501', 'H', 'y', 'b', 'E', '5427', 'H', '1903', '6549', 'K', 'm', '4815', 'l', 'B', '2623', '4251', 'b', '173', 'B', 'I', 1777, 'a', 'g', 'l', 5695, 3689, 'L', 5463, 'G', 'd']