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

Q: CwTYJWQbzEZkvcqKn, hBnhJWQbzEZkKmVM

A: JWQbzEZk
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Q: YlhtTQgHiffTbIbBrcHMqFKCdWz, HyregFgMffTbIbBrcHYUnnQvGlx

A: ffTbIbBrcH
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Q: VMlPpPSuRi, kyiKlPpPkp

A:
lPpP
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