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

Q: VLxrvK, gvxrac

A: xr
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Q: ljwjMioOwfOltGBaE, TneNGsoOwfOlxnWWW

A: oOwfOl
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Q: kWTQrtCaoTbXIiXDphMG, pLhxkfeDoTbXIiXDpCCzTYyZv

A:
oTbXIiXDp
****