In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['W', 771, 's', 'z', 9485, '7819', 'k', 'P', 'j', 'r', 'h', 'K', '929', 'l', '4059', 'm', '3073', '4087', '3249', 'j', 'Z', 8463, 'J', 9631, 6961], [6489, 6975, 8275, 'k', 'y', 'u', 'f', 2437, 'v', 'Y', '7819', 'k', 'P', 'j', 'r', 'h', 'K', '929', 'l', '4059', 'm', '3073', '4087', '3249', 'b', 'w', 25, 7539]