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

[Q]: aiqZheFuLtXAGRCGNBTAX, ssnVdztXAGRCGNBTIqmSJLZcy
[A]: tXAGRCGNBT


[Q]: MvALRGKkpALcKdhTtnm, neMkRGKkpALcKdcaxnXEPxW
[A]: RGKkpALcKd


[Q]: JADcIzDZjricWiTYNHlMCh, KuczojNricWiTYNHFs
[A]:
ricWiTYNH