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

Q: zbSNNVc, agSNNtOQ

A: SNN
****
Q: mCxQTIaXN, mWQTIaxzPT

A: QTIa
****
Q: SQuEHmoUQpWxKpF, QrujEHmoUQCEdc

A:
EHmoUQ
****