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

[Q]: tyVlHfTPLRSdFilXnSfqQ, bkTPLRSdFiMgXC
[A]: TPLRSdFi


[Q]: kOrQWjLKnwN, xFsWjLKgr
[A]: WjLK


[Q]: oGaGjsaKsUpLQAg, iDGjsaKsUoYGuta
[A]:
GjsaKsU