// Source: https://usaco.guide/general/io

#include <bits/stdc++.h>
using namespace std;

int main() {
	int n; cin >> n;
	vector<int> nums(n);
	for (int i = 0; i < n; i++) {
		cin >> nums[i];
	}

	pair<int, int> r = {-1, -1};
	for (int i = 0; i < n-1; i++) {
		if (nums[i] > nums[i+1]) {
			r.first = i;
			break;
		}
	}
	for (int i = n-2; i >= 0; i--) {
		if (nums[i] > nums[i+1]) {
			r.second = i+1;
			break;
		}
	}
	if (r.first != r.second || r.first == -1 || r.second == -1) cout << r.first + 1 << " " << r.second + 1;

}