instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
ilgSzrcUKLTNLJbMKMKSt, hFXIuUKLTNLJbMKWxSCkDjY
answer:
UKLTNLJbMK


question:
tGBRASi, QABRAtL
answer:
BRA


question:
dtwnXA, aLwnjA
answer:

wn