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

SOLUTION: lDAXBgJ

PROBLEM: CkZOSZevST, bbZOSZIg

SOLUTION: ZOSZ

PROBLEM: GnzSpi, iRzSbw

SOLUTION:
zS