#include <iostream>

#include <cstdio>

using namespace std;

const int MX = 1e3+;

int a[MX];

int main()

{

    bool flag = true;

    int n;

    scanf("%d", &n);

    for(int i = ; i <= n; ++i) scanf("%d", &a[i]);

    int le = , ri = ;

    for(int i = ; i <= n; ++i)

    {

        if(a[i] != i)

        {

            le = i;

            break;

        }

    }

    for(int i = n; i >= ; i--)

    {

        if(a[i] != i)

        {

            ri = i;

            break;

        }

    }

    if(le ==  && ri == ) flag = false;

    for(int i = le; i <= (le+ri)/; ++i)

    {

        swap(a[i], a[ri-i+le]);

        //printf("%d %d\n", a[i], a[ri-i+le]);

    }

    for(int i = ; i <= n; ++i)

    {

        //cout << a[i];

        if(a[i] != i)

        {

            flag = false;

            break;

        }

    }

    if(flag) printf("%d %d\n", le, ri);

    else printf("0 0\n");

}