In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

vISTrmBMpQyanUTSXUCm, dJGyOHMpQyanUTpSb
MpQyanUT

JzbEpAquDJFKcNvEWZxVqRV, PFiJlpAquDJFKcNcqOpMeAv
pAquDJFKcN

KJswoapnXz, EQswoaFyH

swoa