In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['c', 'h', 9399, 'U', 'e', '1183', '9537', 'K', 'e', 'p', 'i', 'W', 'T', 9917, 'F', 'g', 8159], [4949, 'I', 'r', 4087, 'U', 'e', '1183', '9537', 'K', 'e', 'p', 'z', 9843]