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

HorIyjpfBFmKZQUIEoP, AcWOaOgVPmyjpfBFmKZQPFYiI
yjpfBFmKZQ

faHRBWyXsYzYmHQyy, aHTyXsYzYeXBFV
yXsYzY

TxBIhCYTJhLBUUgX, wgxpSmhCYTJhXeoT

hCYTJh