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

Q: wNiHcaiUPHnjp, aSTmjcaiUPHFzOu

A: caiUPH
****
Q: mJoHBJehHtkFS, ZMrDxHBJehHtxS

A: HBJehHt
****
Q: xwSLATOOlzUIICbY, FSATOOlzkHPzfd

A:
ATOOlz
****