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

Answer: hCovKplukM


Question: BTvLVMYp, mjOvLVMqYo

Answer: vLVM


Question: CSDAXj, YvDAFS

Answer:
DA