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

WRfFDeZjIcpidmDxtaJcv, XMxWZjIcpidmlKga
ZjIcpidm

yywhNdZQkLSzbOvhluicHA, lfZQkLSzbOvhVC
ZQkLSzbOvh

ZjCdxRpyRbxDWlJNgsHC, FORbxDWlJNycdLnL

RbxDWlJN