In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['m', 9141, 1517, '947', 'r', '9203', 's', 'l', 'z', 'q', '2485', '4633', 'O', 'Y', '2487', 'A', 'i', 'l', 'X', '2639', 'J', 1575, 'x', 'R', 'u', 'F', 'h', 'W', 8941, 'G', 8263, 5145, 175, 4211, 'd', 'S', 'y'], ['x', 5531, 'f', 3957, 'N', 8411, 5841, 'C', 2931, 's', 3195, 'U', 'W', 5647, '947', 'r', '9203', 's', 'l', 'z', 'q', '2485', '4633', 'O', 'Y', '2487', 'A', 'i', 'l', 'X', '2639', 'a', 'S', 6655, 'P', 'H', 7865, 'V', 7969, 'Z', 't', 'p']