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

SOLUTION: BJD

PROBLEM: RwduMBkDazrwZP, UPzcwtWMBkDazrAw

SOLUTION: MBkDazr

PROBLEM: ROyNkXIWIEYb, zMSDkXIWIEzw

SOLUTION:
kXIWIE