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

Q: gTjTwC, OUjTgM

A: jT
****
Q: CkZOSZevST, bbZOSZIg

A: ZOSZ
****
Q: eoTyRzbUiHZxvqETss, BhUCIiHZxvqETdAVma

A:
iHZxvqET
****