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

UZbmGVDzIaf, qfHwqGVDzIsd
GVDzI

pYmzRnGPQVPrqPApKTyvaO, tNGPQVPrqPVTh
GPQVPrqP

LphdgdwOtHjHQ, saAIgdwOtkGq

gdwOt