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

SOLUTION: cCdgbRG

PROBLEM: BdqUloJanutXoOyfLsuA, NRDloJanutXoOQY

SOLUTION: loJanutXoO

PROBLEM: xzHZssVN, KIeHZsVS

SOLUTION:
HZs