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

SOLUTION: zfc

PROBLEM: jexvmCmveGzFUimQMx, RVwOSJveGzFUimrcOwjEwe

SOLUTION: veGzFUim

PROBLEM: GySQaZsvvvfNyiVBscNu, sCuTvvfNyiVBvG

SOLUTION:
vvfNyiVB