In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['I', 583, 4045, 't', 'N', 'H', '1017', 'u', '7255', '8583', 'M', 'x', '143', 'e', 'l', 'U', 'S', '791', 'a', '6927', '3887', 'R', 'i', 493, 2571, 7837], ['E', 3649, 'M', 7321, 8477, 1609, 'p', '1017', 'u', '7255', '8583', 'M', 'x', '143', 'e', 'l', 'U', 'S', '791', 'a', '6927', '3887', 'j', 4719, 'u', 'F', 'U', 'P', 'c', 3121, 'u', 6871, 'T']