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

SOLUTION: EuutntEB

PROBLEM: VpJvIZdkzKovjc, BZEizZdkzKYZ

SOLUTION: ZdkzK

PROBLEM: LvTnqwKF, Lanqwhhe

SOLUTION:
nqw