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

Q: RJMYumLAlhmnbhzKRzIOWsGrxGu, VEViqlihmnbhzKRzIBArjAhYrz

A: hmnbhzKRzI
****
Q: plSfJAktMfac, TCjYJAktlt

A: JAkt
****
Q: QnGizMfdbnonWrFPxGX, EwmXkbnonWrFPxWBvxXtDuF

A:
bnonWrFPx
****