scanf() without field width limits can crash with huge input data.

[codacy-production]

Codacy detected an issue:

Message: scanf() without field width limits can crash with huge input data.

Occurred on:

• Commit: 9d307dd
• File: [Phone Code.cpp](https://github.com/7elmie/CodeForces/blob/9d307dd11e0d10658a61ff2516529ff7faa8c742/Phone Code.cpp)
• LineNum: [9](https://github.com/7elmie/CodeForces/blob/9d307dd11e0d10658a61ff2516529ff7faa8c742/Phone Code.cpp#L9)
• Code: scanf("%d%s", &n, s0);

Currently on:

• Commit: ebeda48
• File: [Phone Code.cpp](https://github.com/7elmie/CodeForces/blob/ebeda48fb07fb6d7943022e92c86d4b3236afd4d/Phone Code.cpp)
• LineNum: [7](https://github.com/7elmie/CodeForces/blob/ebeda48fb07fb6d7943022e92c86d4b3236afd4d/Phone Code.cpp#L7)