In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[7943, 'b', 1923, 603, 'B', 7811, 7079, 'U', 1659, 'Q', 'E', '7317', 's', '7037', '6579', '2911', 'v', 'l', 'M', 'V', '6577', '6067', '5155', 'S', '4527', 'R', 'D', '5831', 'V', '2123', 'E', 'c', 'Y', 1577, 'r', 'D', 1907, 4171, 'm', 'V', 'f'], [2989, 'i', 477, 6503, 6537, 'E', '7317', 's', '7037', '6579', '2911', 'v', 'l', 'M', 'V', '6577', '6067', '5155', 'S', '4527', 'R', 'D', '5831', 'V', '2123', 'k', 'O', 2147, 2617, 6033, 7411, 1905, 9999, 'G', 'U', 8333, 1033, 79, 3267, 'H', 4635]