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

Q: PzXzvmYrlGZgOBk, iKnzvmYrlGZgOrs

A: zvmYrlGZgO
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Q: YlhtTQgHiffTbIbBrcHMqFKCdWz, HyregFgMffTbIbBrcHYUnnQvGlx

A: ffTbIbBrcH
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Q: wQFIMLclwttBTpOWulJTZ, szoYqSttBTpOWulukweNfF

A:
ttBTpOWul
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