In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['D', 6319, 'M', 's', 'Y', '7087', '7123', 'D', 'u', 'm', '891', 's', 'p', '3883', 'C', 'y', 'G', 'C', 'c'], [2191, 'f', 5953, 9819, 'g', 'T', 'K', 'X', 'Y', '7087', '7123', 'D', 'u', 'm', '891', 's', 'p', '3883', 'C', 'y', 'G', 't', 2463, 9301, 'x', 8503, 'a', 5065, 973, 7609]