instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
DhhYhrqVMXSoyvXQwqPKzWARAP, CaMXSoyvXQwqcDDtMsVqD
answer:
MXSoyvXQwq


question:
XpFCxFOgTTNCnQzMnVPV, FMqzdOwgTTNCnQzedorxVPe
answer:
gTTNCnQz


question:
jATLwXKgDdlOwdO, QJXwXKgDdlOJeitzF
answer:

wXKgDdlO