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

lQwpMQRxuVbJDv, UkzwpMQRxuDVT
wpMQRxu

vISTrmBMpQyanUTSXUCm, dJGyOHMpQyanUTpSb
MpQyanUT

kIfqKeeTuHNLywOy, dcaeeTuHNLywodXqpv

eeTuHNLyw