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

Q: MSxTzCpiJAplpzSvLlNJS, oScCpiJAplpNVrqkn

A: CpiJAplp
****
Q: GlAYDsKQoXy, IxDsKQuK

A: DsKQ
****
Q: ZhnnlbsCvgOuPFEInExoYYCSlCn, gfXjgOuPFEInEPLbge

A:
gOuPFEInE
****