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

Input: Consider Input: nOfXJySmVaJIindcJavXh, YpJWmVaJIindcJnoxyRvunG

Output: mVaJIindcJ

Input: Consider Input: nrIHKzJCdAQzUDRBYpg, JDzJCdAQzUMMYrLcfO

Output: zJCdAQzU

Input: Consider Input: QvtDqzQiSknPbRCG, hVxHdqzQiSknPbumdpNIf
Output: qzQiSknPb