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

Q: JAGuNgaUudP, eojvKNgaUuQg

A: NgaUu
****
Q: oDdulHNcCdgbRGxiBTxM, kDcCdgbRGnsJlvas

A: cCdgbRG
****
Q: IgNYAJnFbNuLABfKcTWS, DAJyPUEFbNuLABfKccK

A:
FbNuLABfKc
****