instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
UmYbssMbmsXkKQuzNasLOib, EMqlbmsXkKQuzNcyHrpZXOQW
answer:
bmsXkKQuzN


question:
bdCOjNchdKtvWzOI, FwejNchdKhEd
answer:
jNchdK


question:
EyvnjbVLF, vqnjblzR
answer:

njb