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

SOLUTION: dzqdaG

PROBLEM: mvIvSzMtYsfVLdaGEmef, wnzMtYsfVLdaKm

SOLUTION: zMtYsfVLda

PROBLEM: mfTUwV, GJTUZG

SOLUTION:
TU