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

SOLUTION: am

PROBLEM: YRNpKFPGzUsgCOBJgbVG, TdEpMngFPGzUsgCOZykYRrLp

SOLUTION: FPGzUsgCO

PROBLEM: JtFSttVezzPnfDIKLV, qWbqlDXBFSttVezzPDpyL

SOLUTION:
FSttVezzP