instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
UysTOtIRtRorNAFKKYD, icDOtIRtRoropYVaKzJ
answer:
OtIRtRor


question:
KKrCLvJKRoyV, WDeLvJKCBdS
answer:
LvJK


question:
piuuCgEeMvtsAKdDnZ, BVdsgEeMvtsrseqdeK
answer:

gEeMvts