#include<cstdio>

using namespace std;

const int nmax=5005;

int v[nmax],d[nmax],t[nmax];
bool used[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;
    d[n]=1;
    t[n]=n;
    v[0]=1000005;
    for(i=n-1;i;--i)
    {
        d[i]=1;
        t[i]=i;
        maxim=5005;
        minim=0;
        for(j=i+1;j<=n;++j)
            if(v[i]<=v[j]&&v[j]<v[minim]&&d[j]<=maxim)
            {
                minim=j;
                maxim=d[j];
                t[i]=j;
                used[j]=1;
            }
        if(maxim!=5005)
            d[i]=maxim+1;
    }
    maxim=-1;
    for(i=1;i<=n;++i)
        if(!used[i]&&(maxim==-1||d[maxim]>d[i]||(d[maxim]==d[i]&&v[maxim]>v[i])))
            maxim=i;
    printf("%d\n",d[maxim]);
    while(t[maxim]!=maxim)
    {
        printf("%d ",maxim);
        maxim=t[maxim];
    }
    printf("%d",maxim);
}