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:
TnHJcxtwcZ, XFdHJcxNKw
answer:
HJcx


question:
adNnxkzoVMzqPQ, iguZlNnxkzoSsnrFs
answer:

Nnxkzo