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

cCDTMXjGMNikONun, jpcMXjGMNizBEWQzT
MXjGMNi

xeKSiBafhOWBbYwlGaQ, GUfIsKgafhOWBbYiFWnptAt
afhOWBbY

rVcGghrMWibaisKu, ySOrMWibaiaTjQ

rMWibai