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

SOLUTION: BMF

PROBLEM: uDaqoOpUtLDdTGTO, ncIgBjDPqoOpUtLDdTNtiEyarDO

SOLUTION: qoOpUtLDdT

PROBLEM: QWHxaKUpFfve, fhkaKUpjH

SOLUTION:
aKUp