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

Q: jXqEDHTCxTiUAICWZJdpmYq, GBTCxTiUAICZKnLgZBXi

A: TCxTiUAIC
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Q: SeXNqRAbKdLuWXgb, npsIWRAbKdLuUWSbvuS

A: RAbKdLu
****
Q: rTKcQdgMDTZDvGZQIXp, wcKfgMDTZDvMioAizZ

A:
gMDTZDv
****