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

Q: jyJrDIhxJtWbnooEXZ, uyXifNCIhxJtWbnVCUrt

A: IhxJtWbn
****
Q: XSnVeAjWLFWTgwmf, WsByLAjWLFWnQfl

A: AjWLFW
****
Q: jvsbHh, nEsbwG

A:
sb
****