In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[6883, 4445, 4001, 'f', 8233, 'W', 'I', 6389, 'I', 755, 'L', '871', '3119', 's', '9905', 'a', '9965', 'F', '1921', '2763', 'T', '9487', 'V', 'c'], [2275, 'M', 'J', 9881, 783, '871', '3119', 's', '9905', 'a', '9965', 'F', '1921', '2763', 'T', '9487', 'n', 't', 'o', 'P', 'm', 349, 4265, 1835, 4979, 'R']