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

xzMUdHcoYJFWLOILjrg, vCscoYJFWLzO
coYJFWL

vISTrmBMpQyanUTSXUCm, dJGyOHMpQyanUTpSb
MpQyanUT

FIRLddANlIEhiNlOe, kQeEJLddANlIEKIwX

LddANlIE