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

SJIkEibGrqcrOBgGjYjJc, EervOGrqcrOBgGJZyx
GrqcrOBgG

bOvlVNWf, iivlVzWt
vlV

pAxUuiXQD, oqAsxUuiXVM

xUuiX