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

Q: GrvtMjEvRlmN, ifGOWMjEvRPSOZK

A: MjEvR
****
Q: HKqfdEvqDuGhWByFlzIEeYh, VVaZfkLCMuGhWByFlzIOZaXbMCA

A: uGhWByFlzI
****
Q: cRvALGGvvpivEmA, MOmqnpALGGvvplLInQT

A:
ALGGvvp
****