In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
[7281, 3887, 'i', 2741, 6469, 'w', 'U', '6501', 'w', '4781', 'B', '5949', '9239', 'c', 'D', '4967', '4977', '7633', '8887', 'L', 'I', 'w', 7147, 'R', 'u', 21, 5541, 3581, 1951, 1939, 4589, 8633], [3825, 'W', 'o', 'h', 'R', 'u', 9433, 'B', 9533, 'U', '6501', 'w', '4781', 'B', '5949', '9239', 'c', 'D', '4967', '4977', '7633', '8887', 'm', 4471, 1675, 2583, 9983, 'P', 'n', 'd', 1419, 'N']