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

Q: xeKSiBafhOWBbYwlGaQ, GUfIsKgafhOWBbYiFWnptAt

A: afhOWBbY
****
Q: DnAzbgMtdPKsNCMpBfc, QdfXRkWREzbgMtdPKsGx

A: zbgMtdPKs
****
Q: UiaECWZf, gRyaECWLGRl

A:
aECW
****