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

Q: UysTOtIRtRorNAFKKYD, icDOtIRtRoropYVaKzJ

A: OtIRtRor
****
Q: NUuLSmDjCKcJPc, lGGSLIDjCKcJBo

A: DjCKcJ
****
Q: nlBqrykjNOK, FFOrqrykbUnY

A:
qryk
****