In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

Q: UovaYpHjYSQzrfsxRfvIZE, pUOFxIKOGQzrfsxRfvIjrza

A: QzrfsxRfvI
****
Q: bUHPpvVtFQNSpUdg, zggEFoKBHPpvVtFQNHXsc

A: HPpvVtFQN
****
Q: iJbjApY, ggwbjAws

A:
bjA
****