// inverzio.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <vector>
#include <climits>

using namespace std;
int main()
{
	int a, n; cin >> n;
	vector <int> poz(n + 1);
	for (int i = 1; i <= n; ++i) {
		cin >> a;
		poz[a] = i;
	}
	int maxitav = INT_MIN;
	int akt = poz[1], kezd = -1, veg = -1;
	for (int i = 2; i <= n; ++i) {
		if (akt < poz[i]) {
			akt = poz[i];
		}
		else {
			if (maxitav < akt - poz[i]) {
				maxitav = akt - poz[i];
				kezd = poz[i];
				veg = akt;
			}
		}
	}
	cout << kezd << " ";
	if (kezd != -1) {
		cout << veg;
	}
}

// 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