CF31A.Worms Evolution

Professor Vasechkin is studying evolution of worms. Recently he put forward hypotheses that all worms evolve by division. There are $n$ forms of worms. Worms of these forms have lengths $a_{1}$ , $a_{2}$ , ..., $a_{n}$ . To prove his theory, professor needs to find 3 different forms that the length of the first form is equal to sum of lengths of the other two forms. Help him to do this.

The first line contains integer $n$ ( $3<=n<=100$ ) — amount of worm's forms. The second line contains $n$ space-separated integers $a_{i}$ ( $1<=a_{i}<=1000$ ) — lengths of worms of each form.

Output 3 distinct integers $i$ $j$ $k$ ( $1<=i,j,k<=n$ ) — such indexes of worm's forms that $a_{i}=a_{j}+a_{k}$ . If there is no such triple, output -1. If there are several solutions, output any of them. It possible that $a_{j}=a_{k}$ .