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

Q: sGrHRmELarByxp, cDCUnmELarBXbEfM

A: mELarB
****
Q: gfDDsblwUryUw, UWaRisblwUTqTM

A: sblwU
****
Q: tFFAwzUskgjJyW, iRwzUskgjqRq

A:
wzUskgj
****