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

[EX Q]: ilgSzrcUKLTNLJbMKMKSt, hFXIuUKLTNLJbMKWxSCkDjY
[EX A]: UKLTNLJbMK

[EX Q]: koddLvYmRXDUuUnW, GnqDYGmmRXDUuUquAnf
[EX A]: mRXDUuU

[EX Q]: oQFRkofUK, JemRkoaI
[EX A]:
Rko