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

Q: KTAFonizDqCVvucpJWrItdw, rfFonizDqCVvYbGhb

A: FonizDqCVv
****
Q: yhhzISsXKEbA, KlPrazISsXKzmrVBG

A: zISsXK
****
Q: esxPKNkDsKULBfhF, dGKNkDsKUEny

A:
KNkDsKU
****