In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['E', 6797, 6919, 'x', 1017, 'k', '7333', 'u', '9291', 'e', '1621', 'R', '6477', 'E', 'b', 'I', '2755', 'o', 'I', 'Q', 'O', 5335, 'z', 1271, 'S', 7073], ['N', 'z', 'q', 'r', 'u', 't', 'L', 'f', 8733, 'C', 1903, '7333', 'u', '9291', 'e', '1621', 'R', '6477', 'E', 'b', 'I', '2755', 'o', 'Z', 'C', 221, 7243, 7983, 'h', 3657, 's', 'Q']