In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['Q', 'N', 'm', 'L', 2015, 'W', 'D', 'd', 'c', 'Q', 'I', 'N', 'W', 'j', 'A', 6921, 'X', 'H', 'N', 'l', 'U', 'p', '4397', 'X', '1559', '167', 'i', '8689', '9273', 'J', 'r', 'a', 'K', '5511', 'R', 'z', 'T', 'f', 'V', 'E', 'V', 6753, 'z', 2281, 'Y', 7397, 115, 3973, 8083, 6475, 'L', 'z', 5969, 3581, 'm', 3171, 3211], ['R', 5629, 'k', 3959, 'R', 'O', 'U', 'V', 'N', 'o', 3345, 'P', 4317, 'M', 'g', 8331, 'v', 'T', 'R', 'Y', 'X', 'H', 'N', 'l', 'U', 'p', '4397', 'X', '1559', '167', 'i', '8689', '9273', 'J', 'r', 'a', 'K', '5511', 'R', 'z', 'T', 'f', 'r', 'u', 9505, 3363, 4823, 'w', 'i', 'B', 'Q', 'Y', 'H', 'R', 2991, 's', 'U', 5579, 'C', 'F', 'E', 'j', 'P']