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

umXfmRnUgALpFAqBaKfNfo, aOAXWnUgALpFAqBmNpTCdj
nUgALpFAqB

MvALRGKkpALcKdhTtnm, neMkRGKkpALcKdcaxnXEPxW
RGKkpALcKd

DDOFNV, BsOFHz

OF

