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

Q: VLxrvK, gvxrac

A: xr
****
Q: FNVeaFmprNHqqtAaKv, iGBmrrMveaFmprNHqWWAvtht

A: eaFmprNHq
****
Q: zcgILGLanA, ehlgILGZaO

A:
gILG
****