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

[Q]: SUgXyznbUQRpiLUTlRb, jlnwLTnbUQRpioUFyJ
[A]: nbUQRpi


[Q]: IGHhMfqLeBpnullsPInfBH, LTDBpnullsPIBynwCrCQ
[A]: BpnullsPI


[Q]: VOcdHLwwGfWPlBV, XWucdHLwwGpAnjBu
[A]:
cdHLwwG