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

Ex Input:
ZKMRTxCxbsbX, iovHrMRTxCxbsjv

Ex Output:
MRTxCxbs


Ex Input:
mJoHBJehHtkFS, ZMrDxHBJehHtxS

Ex Output:
HBJehHt


Ex Input:
zQApwpcOdmitdjRspLXCXd, dXIDYepwpcOdmitdSPiAcXlN

Ex Output:

pwpcOdmitd