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

Q: EOwHDdhJcP, DrIuDdhJYw

A: DdhJ
****
Q: XYnCjAWPHHJ, gmCjAWPHpmwVsm

A: CjAWPH
****
Q: UUDwSirDiK, VajANDwSirBPpY

A:
DwSir
****