// inverzio.cpp : This file contains the 'main' function. Program execution begins and ends there.
//
#include <iostream>
#include <queue>
#include <algorithm>
#define ll long long
using namespace std;
ll n;
int main()
{
cin >> n;
vector<pair<ll,ll>>x(n);
for (int i = 0; i < n; ++i)
{
cin >> x[i].first;
x[i].second = i + 1;
}
sort(x.begin(), x.end(), [](pair<ll,ll> a, pair<ll,ll> b)
{
return a.first > b.first;
});
ll mini = x[0].second,v=0,k=0;
for (int i = 1; i < n; ++i)
{
mini = min(x[i].second, mini);
if(x[i].second - mini > v - k)
{
v = x[i].second;
k = mini;
}
}
if (k == v)cout << "-1";
else cout << k << " " << v;
return 0;
}
// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu
// Tips for Getting Started:
// 1. Use the Solution Explorer window to add/manage files
// 2. Use the Team Explorer window to connect to source control
// 3. Use the Output window to see build output and other messages
// 4. Use the Error List window to view errors
// 5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
// 6. In the future, to open this project again, go to File > Open > Project and select the .sln file