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

yywhNdZQkLSzbOvhluicHA, lfZQkLSzbOvhVC
ZQkLSzbOvh

lypuwWy, jRpuwcE
puw

ZGSJgMNXDbPHqDGD, KFKZKWSJgMNXDUK

SJgMNXD

