How to read integers elegantly using C++ stream?

Question

I have a file full of lines in this format:

1 - 2: 3

I want to only load numbers using C++ streams. Whats the most elegant way to do it? I

Answer 1

I think this one would be the fastest -yet elegant- way:

int a, b, c;
scanf("%d-%d:%d", &a, &b, &c);