instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
inquDFuJxtBaaFGCaRzO, NYcnWDuDFuJxtBafxZWCUw
answer:
uDFuJxtBa


question:
ZKMRTxCxbsbX, iovHrMRTxCxbsjv
answer:
MRTxCxbs


question:
XYveMcWKQavFga, HEveMcWKQuLxL
answer:

veMcWKQ