In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.

[EX Q]: [6137, 1795, 'J', 9247, 'r', 'w', 'E', 's', '687', 'N', '8213', '1751', '2567', '5673', 'y', '6821', '6863', '8847', 'z', 's', 'N', 'z', 'J', 7209, 'S'], [3317, 657, 3971, 8789, 4953, 9693, 'O', 7845, 'r', 'w', 'E', 's', '687', 'N', '8213', '1751', '2567', '5673', 'y', '6821', '6863', '8847', 'z', 's', 'N', 'z', 'M', 'A', 'B', 'l']
[EX A]: r, w, E, s, 687, N, 8213, 1751, 2567, 5673, y, 6821, 6863, 8847, z, s, N, z

[EX Q]: [1231, 'a', 9367, '155', 'r', '1473', '5679', '3161', 'L', 'e', 'b', 'm', '9427', '2001', '5293', '3487', 'K', '6467', 'S', 'e', 6603, 'm', 8145, 'L', 's', 1273, 9291, 'X'], [5773, 'D', 'W', 'F', 5987, 'D', 'H', 2095, 'I', 'X', 29, '155', 'r', '1473', '5679', '3161', 'L', 'e', 'b', 'm', '9427', '2001', '5293', '3487', 'K', '6467', 'S', 'C', 'a']
[EX A]: 155, r, 1473, 5679, 3161, L, e, b, m, 9427, 2001, 5293, 3487, K, 6467, S

[EX Q]: ['K', 6303, '8787', 'f', 'z', 9097], ['I', 2939, '8787', 'f', 'Z', 8695]
[EX A]:
8787, f