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

Q: lypuwWy, jRpuwcE

A: puw
****
Q: zRwQdelc, UdAUwQdejhe

A: wQde
****
Q: KrCqDoqqdGlWZtUJqpfrcfqM, stGUSxOqdGlWZtUJrBfGmqlq

A:
qdGlWZtUJ
****