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

SOLUTION: ZKwv

PROBLEM: UmYbssMbmsXkKQuzNasLOib, EMqlbmsXkKQuzNcyHrpZXOQW

SOLUTION: bmsXkKQuzN

PROBLEM: aaKgENIvyXEaz, aASUNIvyXEckwnuW

SOLUTION:
NIvyXE