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

Answer: dzqdaG


Question: euQWhCovKplukMYznXcD, XAfMhKdzhCovKplukMcMlSuBw

Answer: hCovKplukM


Question: UCvpnqRgrXSHy, ZKptpvpnqRgxssPla

Answer:
vpnqRg