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

Q: HEVqGddewrNqiZ, iyvlddewrNXr

A: ddewrN
****
Q: jexvmCmveGzFUimQMx, RVwOSJveGzFUimrcOwjEwe

A: veGzFUim
****
Q: LasDOQKqSCVt, sfqVxsDOQKqSjBHgKM

A:
sDOQKqS
****