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

hcmMoVBhK, mdmMoVBjuT
mMoVB

GnElFKBIoYmAdvz, GrElFKBIoMo
ElFKBIo

eFUexDIFlaPDUwrOb, mTvkKGUxDIFlaPDUwxGVpnIwbi

xDIFlaPDUw