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

SOLUTION: SN

PROBLEM: koddLvYmRXDUuUnW, GnqDYGmmRXDUuUquAnf

SOLUTION: mRXDUuU

PROBLEM: ccDuVMlDck, zEiDuVMyl

SOLUTION:
DuVM