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

Answer: veGzFUim


Question: gWMyioGBRpwcXfr, AOQGBRpwcSccqBE

Answer: GBRpwc


Question: nfNmIxqiGjrLr, lGZSCmIxqiGjBsogMAg

Answer:
mIxqiGj