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

[Q]: BICndZkjoSidWivWATvtqsS, FzVWjoSidWivFaQhkRT
[A]: joSidWiv


[Q]: mRVieYomZqJXaTDsShCyfPW, ifOAlnptmZqJXaTDsVMqY
[A]: mZqJXaTDs


[Q]: OvgHjULyCtAFe, axVULyCtlqw
[A]:
ULyCt