In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['C', 'i', 3849, 'W', 'j', 2615, 'W', 'R', 'U', 'n', 3733, 517, 'm', 'D', 'A', '3945', '7331', 'H', 'W', '2663', 't', 'R', 'P', '9107', '9161', 'b', 'c', 'P', 'i', 'p', '7061', 'B', 'f', '289', 'Y', 'P', 8371, 4343], ['M', 'J', 'D', 2447, 7885, 3213, 'W', 'x', 6773, 'x', 3391, 'k', 'B', 'X', 3715, 'y', 'F', 'q', '3945', '7331', 'H', 'W', '2663', 't', 'R', 'P', '9107', '9161', 'b', 'c', 'P', 'i', 'p', '7061', 'B', 'f', '289', 'p', 4435, 3809, 3583, 'p', 9415, 'V', 's', 5773, 'g', 2573, 'a', 'z', 'n']