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

UTdardKNThdYrGKMqZPeg, mvrThdYrGKMlcCxBtak
ThdYrGKM

oDdulHNcCdgbRGxiBTxM, kDcCdgbRGnsJlvas
cCdgbRG

UumoTn, bamoPZ

mo