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

Q: PIcbiJj, hedcbiZHF

A: cbi
****
Q: mXHhaCEIwqwEZcz, JZPXbYHhaCEIwZmna

A: HhaCEIw
****
Q: ECYKcaWUOeEzbxTNOLynr, ZDcxjnxYOeEzbxTNfsDSDOeb

A:
OeEzbxTN
****