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

Q: PIcbiJj, hedcbiZHF

A: cbi
****
Q: tyVlHfTPLRSdFilXnSfqQ, bkTPLRSdFiMgXC

A: TPLRSdFi
****
Q: vBLujgQCICNQmhyeAxpYn, dbUYcBGjgQCICNQmROqTj

A:
jgQCICNQm
****