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

SOLUTION: rrMqWzJSL

PROBLEM: ugDpSMRvHM, DDwSMRvxw

SOLUTION: SMRv

PROBLEM: puLsDgpIoplY, aFIDgpIkb

SOLUTION:
DgpI