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

SOLUTION: CjZDoRR

PROBLEM: TUAHhdvHIBxogI, LjfGsAHhdvHJcSdNV

SOLUTION: AHhdvH

PROBLEM: wWMVWbDgoRIbcWW, rNupwpzDgoRIbcdNIcQ

SOLUTION:
DgoRIbc