TASK DEFINITION: In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
PROBLEM: [621, 7677, 'b', '889', '6721', 'H', 'd', 'S'], [8151, 'F', 'b', '889', '6721', 'h', 4123]

SOLUTION: b, 889, 6721

PROBLEM: [5625, 6017, 'd', 'p', '4423', '77', 'E', '5271', 'A', 1553, 'c'], ['U', 1615, 'u', 'd', 'p', '4423', '77', 'E', '5271', 'x', 'w', 'Y']

SOLUTION: d, p, 4423, 77, E, 5271

PROBLEM: ['D', 8695, '401', 'd', '1', 'd', 'u', '2919', '5551', 'W', 'J'], ['P', 8761, 'Q', 5547, 3631, 'k', 8505, '401', 'd', '1', 'd', 'u', '2919', '5551', 'I', 1101, 'd']

SOLUTION:
401, d, 1, d, u, 2919, 5551

