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

UTdardKNThdYrGKMqZPeg, mvrThdYrGKMlcCxBtak
ThdYrGKM

lypuwWy, jRpuwcE
puw

vYjKPwVx, EfKPwUvL

KPw