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: a232082
• File: [Sum of Digits.cpp](https://github.com/7elmie/CodeForces/blob/a2320828649527aa91326466ece66af8be46c244/Sum of Digits.cpp)
• LineNum: [7](https://github.com/7elmie/CodeForces/blob/a2320828649527aa91326466ece66af8be46c244/Sum of Digits.cpp#L7)
• Code: scanf("%s", digits);

Currently on:

• Commit: 9a6a6a0
• File: [Sum of Digits.cpp](https://github.com/7elmie/CodeForces/blob/9a6a6a059837e89f9bdbe208bc7b6bfead9243c1/Sum of Digits.cpp)
• LineNum: [7](https://github.com/7elmie/CodeForces/blob/9a6a6a059837e89f9bdbe208bc7b6bfead9243c1/Sum of Digits.cpp#L7)