In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

Q: TnHJcxtwcZ, XFdHJcxNKw

A: HJcx
****
Q: fCGEhfHvcRouHzNw, gtjBkhfHvcRouHee

A: hfHvcRouH
****
Q: rPygCfzmQsq, aKdXgCfzIEED

A:
gCfz
****
