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:
VutZiVkDQcVpQO, BDQVDyBdiVkDQcVpuvNN
answer:
iVkDQcVp


question:
TpaUHRqjuNpnhpNvMoeHqL, NddUHRqjuNpnhYWuLLwPYS
answer:

UHRqjuNpnh