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

Q: MSzHyOuaJILkeY, eUibEHoHyOuaJIhfvXy

A: HyOuaJI
****
Q: wDSKHtWbCDqTeoBeiYHdcZD, MydQCwqTeoBeiYHdYMp

A: qTeoBeiYHd
****
Q: OPQRPfKWAMiXYLCm, XqZihtkRPfKWAMuI

A:
RPfKWAM
****