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: YKpdeJQhzyYiPoODACUu, mjmnIlCehzyYiPoOzZ

Answer: hzyYiPoO


Question: yKtQOhYvrJVH, HQsTQOhYvPP

Answer: QOhYv


Question: TUnEKJtJ, tFunEKelz

Answer:
nEK