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

SOLUTION: EeiWGONm

PROBLEM: andNlOdIcQMyZvc, vCMENolkslOdIcQMyZJtCFo

SOLUTION: lOdIcQMyZ

PROBLEM: ytJznXKGElww, cjznXKGqF

SOLUTION:
znXKG