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

Q: DGvUCrUVlUnQBShkWnfnceGasvI, NfzGUnQBShkWnpLMnY

A: UnQBShkWn
****
Q: XMtSwZVAHsNYhbyDm, asAVAHsNYhSPuNLrV

A: VAHsNYh
****
Q: dZuwKdBHJZh, bODIuwKdBqVUU

A:
uwKdB
****