#include<cstdio>

using namespace std;

const int nmax=5005;

int v[nmax],d[nmax],t[nmax];

int main()
{
    freopen("subsir2.in","r",stdin);
    freopen("subsir2.out","w",stdout);
    int n,i,j;
    scanf("%d",&n);
    for(i=1;i<=n;++i)
        scanf("%d",&v[i]);
    d[n]=1;
    t[n]=n;
    int minim,maxim;
    for(i=n-1;i;--i)
    {
        d[i]=1;
        maxim=0;
        t[i]=i;
        for(j=i+1;j<=n;++j)
        {
            if(maxim<d[j]&&v[i]<=v[j])
            {
                maxim=d[j];
                d[i]=maxim+1;
                minim=v[j];
                t[i]=j;
            }
            else if(maxim==d[j]&&minim>v[j])
            {
                minim=v[j];
                t[i]=j;
            }
        }
    }
    maxim=0;
    minim=0;
    for(i=1;i<=n;++i)
    {
        if(d[i]>d[maxim])
            maxim=i;
        else if(d[i]==d[maxim]&&v[i]<v[maxim])
            maxim=i;
    }
    printf("%d\n",d[maxim]);
    while(t[maxim]!=maxim)
    {
        printf("%d ",maxim);
        maxim=t[maxim];
    }
    printf("%d ",maxim);
}