In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[2603, 9969, 'j', 'b', 'i', 287, 'x', 'F', '4865', '7423', 'f', '1105', 'i', 'u', 'r', 'Q', 'T', 'P', 'r', '6111', 'a', 'f', 'c', 'o', '8631', '8409', 'g', 6123, 'M', 'H', 7393, 'b', 9591, 8881, 1759, 'Z', 7775, 151, 'u', 1745, 3887, 3321], [7899, 4033, 9493, 'x', 'x', 3401, 'W', 7999, 875, 'x', 'F', '4865', '7423', 'f', '1105', 'i', 'u', 'r', 'Q', 'T', 'P', 'r', '6111', 'a', 'f', 'c', 'o', '8631', '8409', 'd', 'M', 'J', 'W', 689, 't', 7641, 1997, 7189, 7419, 'm', 'd', 'v', 'q', 'j', 'r', 'Z']