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

Q: aZcGMvzBhazkCIFqpVe, AOljBvzBhazkWXeTuA

A: vzBhazk
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Q: bmsrkXGb, GcarkXOZF

A: rkX
****
Q: iTRJUBtdyqQCgBNrZoinzbDT, aEAYyqQCgBNrZorGRhMLsHi

A:
yqQCgBNrZo
****