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

Q: aeQjEeiWGONmzGimhGiw, RIEeiWGONmOZuVYr

A: EeiWGONm
****
Q: wYhGWdRC, cFGWdHEy

A: GWd
****
Q: HGGzzVHvzbudfBFQLbRtX, ssGzzVHvzbudGohijq

A:
GzzVHvzbud
****