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

SOLUTION: Yf

PROBLEM: HaIPcFXLhYDp, AdIPcFXtJdRE

SOLUTION: IPcFX

PROBLEM: joJdyLMjIwHyAKLwnjNrqp, tSNIwHyAKLwUyvDYDB

SOLUTION:
IwHyAKLw