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

wlFcxOHoXC, IWFcxOIWTk
FcxO

ScUCglVzZFPjLVofNHOumU, mNodEXwpZFPjLVofYfSnBM
ZFPjLVof

zNkwBabzcxoZoGfYott, KMRwBabzcxoZbiTH

wBabzcxoZ