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

SOLUTION: zISsXK

PROBLEM: zmbmQuyNGOe, mUMEmQuyiuS

SOLUTION: mQuy

PROBLEM: YtpBiUrvTLtKYLMX, izUrvTLtzxaHJU

SOLUTION:
UrvTLt