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

Q: OYERnjubLFovtcS, FngzQJVGERnjubLFafmzq

A: ERnjubLF
****
Q: nOfXJySmVaJIindcJavXh, YpJWmVaJIindcJnoxyRvunG

A: mVaJIindcJ
****
Q: lqrjLW, Mhrjao

A:
rj
****