#include<bits/stdc++.h>

using namespace std;
ifstream fin("subsir2.in");
ofstream fout("subsir2.out");

#define nmax (int) 1e5 +10
int n,mij,a[nmax],b[nmax],lmax,x,i,c[nmax];
void solve()
{
    int i,p;
    for(i=1;i<=n;i++)
    {
        int m,pr=1,u=i;
        x=a[i];
        while(pr<=u)
        {
        m=(pr+u)/2;
        if(x>a[m])
            pr=m+1;
        else
            u=m-1;
        }
        p=u;
        if(a[i]<b[p+1])
        {
            b[p+1]=a[i];
            c[p+1]=i;
            lmax=max(lmax,p+1);
        }
    }
    fout<<lmax<<'\n';
}
int main()
{
    fin>>n;
    fin>>a[1];
    b[1]=2000000009;
    lmax=1;
    for(i=2;i<=n;i++)
        fin>>a[i],b[i]=2000000009;

    solve();
    for(i=1;i<=lmax;i++)
        fout<<c[i]<<" ";
    return 0;
}