In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
--------
Question: inquDFuJxtBaaFGCaRzO, NYcnWDuDFuJxtBafxZWCUw

Answer: uDFuJxtBa


Question: DnAzbgMtdPKsNCMpBfc, QdfXRkWREzbgMtdPKsGx

Answer: zbgMtdPKs


Question: eMDNXl, ZZDNAa

Answer:
DN