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

SOLUTION: HoDOYx

PROBLEM: QvtDqzQiSknPbRCG, hVxHdqzQiSknPbumdpNIf

SOLUTION: qzQiSknPb

PROBLEM: ooIaXyUh, QAGIaXyEX

SOLUTION:
IaXy