#include<cstdio>

#include<iostream>

#include<algorithm>

using namespace std;

int main()

{

    int n,a[],left = ,right = ;

    cin >> n;

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

    {

        cin >> a[i];

    }

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

    {

        if(a[i] > a[i+])

        {

            left = i;

            break;

        }

    }

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

    {

        if(a[i] < a[i-])

        {

            right = i;

            break;

        }

    }

    reverse(a+left,a+right+);

    int flag = ;

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

    {

        if(a[i] > a[i+])

        {

            flag = ;

            break;

        }

    }

    if(flag)

    {

        printf("yes\n");

        printf("%d %d\n",left,right);

    }

    else

    {

        printf("no\n");

    }

    return ;

}