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]: rlBoVyFsYqpmmQmelGBg, iKKaIyFsYqpmmWcrKn
[A]: yFsYqpmm


[Q]: FmyjkfhYXigyYlEXe, XGSHKAQdLhYXigyYlEElm
[A]:
hYXigyYlE