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

SOLUTION: XDoh

PROBLEM: sbQJFbUtmnKaEJePFPeRM, QzfvkdZbUtmnKaEJNrWD

SOLUTION: bUtmnKaEJ

PROBLEM: LhjcIsfQpk, WkYIsfQgN

SOLUTION:
IsfQ