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

SOLUTION: AznAuFjoBK

PROBLEM: HqaOvLaZbs, RifOvLaZkh

SOLUTION: OvLaZ

PROBLEM: qwPpcOASLorCsA, mBcOASLoHj

SOLUTION:
cOASLo