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

SOLUTION: HcFUCflYUp

PROBLEM: haOsaSQcyodWhqQaC, BKLEUQcyodWhvVkmxBz

SOLUTION: QcyodWh

PROBLEM: sndXQDs, cgPdXQcUv

SOLUTION:
dXQ