In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['c', 'I', 'b', 6113, 'X', 2819, 7937, 'x', 'N', 5051, 'o', 'r', 'z', 'f', 7823, 'm', 'b', 2703, 7217, 3023, 1753, 7107, 'M', '1071', 'H', '7681', '9283', '7659', '9151', 'W', '3635', '3431', 'R', '5387', 'I', '3389', 'p', '5453', '675', 'r', 'S', 'k', '9725', 's', 'J', 'B', '5355', 'n', 7615], [6625, 3641, 'h', 'u', 'M', '1071', 'H', '7681', '9283', '7659', '9151', 'W', '3635', '3431', 'R', '5387', 'I', '3389', 'p', '5453', '675', 'r', 'S', 'k', '9725', 's', 'J', 'B', '5355', 'g', 'D', 'Z', 'y', 'k', 'h', 'I', 3673, 4321, 'u', 'L', 'x', 9415, 'o', 8205, 1497, 'D', 6639]