In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['t', 'C', 'I', 9727, 'z', 'Q', 8667, 3681, 337, 8637, 5437, 'A', 't', 5239, '2995', '1431', 'P', '5563', '9415', '2137', 'F', '2633', '975', 'P', 'H', 'V', '9861', 'r', 'N', 'L', 'L', 'G', 3993, 'I'], [7207, 1089, 3749, 'I', 5945, '2995', '1431', 'P', '5563', '9415', '2137', 'F', '2633', '975', 'P', 'H', 'V', '9861', 'r', 'N', 'L', 'L', 'r', 'c', 'x']