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

inquDFuJxtBaaFGCaRzO, NYcnWDuDFuJxtBafxZWCUw
uDFuJxtBa

KfjqnJLciTXqkJK, yqfRcfqnJLcisSB
qnJLci

JwDZMMdTGcCvRAonGfghs, xpvlGSjBpZMMdTGcCvpx

ZMMdTGcCv