TASK DEFINITION: In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
PROBLEM: aeQjEeiWGONmzGimhGiw, RIEeiWGONmOZuVYr

SOLUTION: EeiWGONm

PROBLEM: XpFCxFOgTTNCnQzMnVPV, FMqzdOwgTTNCnQzedorxVPe

SOLUTION: gTTNCnQz

PROBLEM: CBllXBh, syllXcN

SOLUTION:
llX