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

SOLUTION: PZYoKUoQn

PROBLEM: CkZOSZevST, bbZOSZIg

SOLUTION: ZOSZ

PROBLEM: VGzaIXCnl, ZDetzaIXCXnf

SOLUTION:
zaIXC