In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['U', 'k', 9983, 'e', 3231, 'p', 6447, 'e', 'p', 3397, 4001, 'O', 'f', 5975, 'Z', 'K', 'b', '1019', '1629', 'D', 'I', '6197', 'K', '7967', 'B', '7205', 'V', '6793', '1069', 'G', '7983', '8937', '417', '8497', '7595', 'F', 's', 'Q', 'Z', 'M', 'R', '5825', '8609', '3475', 's', 5723, 6049, 2563], [521, 7717, 8779, 'n', 5309, 9767, 423, 6511, 'I', 'X', 'N', 1639, 'B', 'o', 4267, 'T', 'b', '1019', '1629', 'D', 'I', '6197', 'K', '7967', 'B', '7205', 'V', '6793', '1069', 'G', '7983', '8937', '417', '8497', '7595', 'F', 's', 'Q', 'Z', 'M', 'R', '5825', '8609', '3475', 'z', 5615, 4493, 6435, 'H', 767, 7445, 'y', 1211, 5703, 'o']