#include <fstream>

using namespace std;
ifstream f("subsir2.in");
ofstream g("subsir2.out");
int n,p,i,j,k,mi,ma,v[5001], l[5001];
int main()
{f>>n;
for(i=1;i<=n;++i)
    f>>v[i];
l[n]=1;
for(i=n-1;i>=1;--i)
{
    ma=0;
    for(j=i+1;j<=n;++j)
        if(v[i]<v[j] && l[j]>ma)
        ma=l[j];
    l[i]=ma+1;
}
ma=0;
for(i=1;i<=n;++i)
    if(l[i]>ma)
{
    ma=l[i];
    k=i;
}
g<<ma<<endl;
g<<k<<" ";
--ma;

for(i=k+1;i<=n;++i)
    if(l[i]==ma)
    {mi=v[i];
        for(j=i+1;j<=n;++j)
            if(v[j]<mi && v[k]<v[j])
        {
            mi=v[j];
            p=j;
        }

        g<<p<<" ";
        k=p;
        --ma;
    }
    return 0;
}