instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
mRVieYomZqJXaTDsShCyfPW, ifOAlnptmZqJXaTDsVMqY
answer:
mZqJXaTDs


question:
sbQJFbUtmnKaEJePFPeRM, QzfvkdZbUtmnKaEJNrWD
answer:
bUtmnKaEJ


question:
wPyPFHHsNKzOro, JnPHsNKzOJMwTb
answer:

HsNKzO