// inverzio.cpp : This file contains the 'main' function. Program execution begins and ends there.
//
#include <iostream>
#include <deque>
#include <algorithm>
#include<climits>
using namespace std;
struct adat
{
int szam, hely;
};
bool hasonlit(adat a, adat b)
{
if (a.szam > b.szam) return 1;
else return 0;
}
deque<adat>x;
int i, n, j, k,kezd,veg;
adat mini, maxi;
int main()
{
cin >> n;
x.resize(n + 1);
for (i = 1; i <= n; ++i)
{
cin >> x[i].szam;
x[i].hely = i;
}
sort(x.begin(), x.end(), hasonlit);
mini.szam = x[1].hely;
for (i = 2; i <= n; ++i)
{
if (x[i].hely < mini.szam) mini.szam = x[i].hely;
else if (x[i].hely - mini.szam > veg-kezd)
{
kezd = mini.szam;
veg = x[i].hely;
}
}
if (!(veg - kezd)) cout << -1;
else cout << kezd << " " << veg;
return 0;
}
/*
5
4 3 5 1 2
*/
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// Debug program: F5 or Debug > Start Debugging menu
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