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

Answer: pBHsrf


Question: jJjsASFfCqVV, AkjsASFfBFwPy

Answer: jsASFf


Question: ylNPXBjNKwcQCZqroWHfFeC, BtruLhKwcQCZqrfalDdR

Answer:
KwcQCZqr