instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
jexvmCmveGzFUimQMx, RVwOSJveGzFUimrcOwjEwe
answer:
veGzFUim


question:
egYXVtCPvWxP, VMOolyVtCPvWjIx
answer:
VtCPvW


question:
gGqIJC, AkqIWw
answer:

qI