In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['R', 'p', 'U', 'a', 8099, 1239, 'M', 'r', '6623', '4109', '8309', '1849', 'O', 'D', '7303', '1415', '5589', 'H', '1125', 'r', 'e', 'Y', 1121, 'j', 9389, 's', 2075, 3761], [3883, 7655, 'L', 'n', 5425, '6623', '4109', '8309', '1849', 'O', 'D', '7303', '1415', '5589', 'H', '1125', 'h', 'm', 1209]