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

fdinRdwwlntwqzYGhV, ZefonRdwwlntoWQbh
nRdwwlnt

sUdaWtsiRgqAYHykrHwjyDvZgD, MJdFXYiRgqAYHykrakSGHMr
iRgqAYHykr

gEPdrHWQUQR, gbePdrHWyP

PdrHW