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

SOLUTION: wlZDJSEFP

PROBLEM: OXdSmcKG, XbDdSmJl

SOLUTION: dSm

PROBLEM: OBOsWMNpllUXzQQcxH, XWSNpllUXgdAak

SOLUTION:
NpllUX