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

WTnsmP, INnsIM
ns

elloYaejTczBiiNOU, XoCPzloYaejTcXYtKODL
loYaejTc

tcYRCxDPRvZSFAagrf, gTqNAyfszYxDPRvZSFAaFqEoh

xDPRvZSFAa