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

RwqzMTeLMdPx, qaWtYhqzMTeLMdHbWDT
qzMTeLMd

fAsWQxuyBevvLogrSrgg, tmdBEUxuyBevvLogXjiMCbh
xuyBevvLog

uxaScZYz, jSgaScZmEyx

aScZ