#include <bits/stdc++.h>

using namespace std;

int main()
{
    cin.tie(0);cout.tie(0);iostream::sync_with_stdio(0);

    int N,largest,length=0,start = -1;
    cin >> N;

    vector<int> elemek(N);

    for(int i = 0; i < N; i++)
    {
        cin >> elemek[i];
    }

    for(int j = 0; j < N-length;j++)
    {
        if(elemek[j] > largest)
        {
            largest = elemek[j];
            for(int i = j+length; i < N-length; i++)
            {
                if(elemek[j] > elemek[i] && i-j > length)
                {
                    length = i-j;
                    start = j;
                }
            }
        }
    }

    if(start == -1)
    {
        cout << -1;
    }
    else
    {
        cout << start+1 << " " << start+length+1;
    }

}