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

Q: vhZuXCsIkQR, YflCuXCsIkLu

A: uXCsIk
****
Q: oXZmCSdFrMumlZcP, eFpOZmCSdFrIuHeS

A: ZmCSdFr
****
Q: nsGpAPHyFRPDq, qTDVpAPHyyO

A:
pAPHy
****