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

Q: GrvtMjEvRlmN, ifGOWMjEvRPSOZK

A: MjEvR
****
Q: gwVLygvd, VOQLyglfo

A: Lyg
****
Q: zGPaEkdrdFOUpPxneQ, ErAPaEkdrdFXt

A:
PaEkdrdF
****