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:
UmYbssMbmsXkKQuzNasLOib, EMqlbmsXkKQuzNcyHrpZXOQW
answer:
bmsXkKQuzN


question:
vbQBuGLJvgSUvOnnNvuJ, JKuGLJvgSUOIs
answer:

uGLJvgSU