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

Q: esIMEOgV, tNIMEybb

A: IME
****
Q: Owbiay, exbime

A: bi
****
Q: mREEekducyQatbhNudW, cNmjkducyQaPV

A:
kducyQa
****