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: bOvlVNWf, iivlVzWt

Answer: vlV


Question: wbdHVigIkjNkuAmbr, iSgIkjNkQYyn

Answer: gIkjNk


Question: jeQzwP, kSQzxq

Answer:
Qz