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

Q: EeUODjkxsQeTSNsHYpBKIUvEuAKhB, SrpZeTSNsHYpBKdhPFlgMh

A: eTSNsHYpBK
****
Q: JqdTDnZqSuSVcMsx, TEtDDnZqSuZa

A: DnZqSu
****
Q: YLHXnAytcVFRs, ceFjWvHXnAytcVFZeWo

A:
HXnAytcVF
****