In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['E', 'i', 5109, 461, 'E', 'o', 'g', 'z', 't', '4531', '4955', 'P', '699', '4563', '8593', 'B', '8209', '7789', '4215', '75', 'W', 'E', 'm', 7809, 'Z', 'I', 9763], [3689, 2037, 'n', 't', '4531', '4955', 'P', '699', '4563', '8593', 'B', '8209', '7789', '4215', '75', 'W', 'E', 'E', 'U']