In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['B', 5197, '4445', '699', 's', '487', 'x', '15', '6693', 'd', '327', 'Q', 'v', 'b', '8847', 'K', '7941', '6825', '7821', 'Z', 'L', 'o', 'a', 8769, 9037, 7515, 747, 'y', 3375, 1253, 'K', 'g'], [1423, 'h', 7437, 't', 9877, 'p', 'J', 'U', 1335, 5273, 'x', 8141, 'u', 'c', '4445', '699', 's', '487', 'x', '15', '6693', 'd', '327', 'Q', 'v', 'b', '8847', 'K', '7941', '6825', '7821', 'a', 3657, 517, 'a', 'W', 1587, 3289, 'R']