CF 3pb

#include <bits/stdc++.h>
#define uns unsigned
#define ll long long
#define newline '\n'
using namespace std;
///**************************contest setup

const uns NMAX(3005);
set <int> s;
int v[NMAX];

int main()
{
    int n, nr(3);
    cin >> n;
    for (int i = 1; i <= n; i++)
    {
        cin >> v[i];
        s.insert(v[i]);
    }

    if ((int)s.size() < nr)
    {
        while (nr--)
            cout << -1 << ' ';
    }
    else
    {
        for (auto it = s.begin(); it != s.end() && nr--; it++)
        {
            int x = *it;
            for (int i = 1; i <= n; i++)
                if (x == v[i])
                {
                    cout << i << ' ';
                    break;
                }
        }
    }
    return EXIT_SUCCESS;
}