instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
cvRdSsuNwGVEwSSrowDpaOu, gFMcLKIeLwNwGVEwSSroUGskaoloqC
answer:
NwGVEwSSro


question:
jexvmCmveGzFUimQMx, RVwOSJveGzFUimrcOwjEwe
answer:
veGzFUim


question:
KsExmntVjFvUVShTv, kxmNetVjFvUiPqlu
answer:

tVjFvU