#include <bits/stdc++.h>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n,i,j,k,st,dr,mid,pos,v[100001],dim[100001],aux[100001],t[100001],maxim;
void show(int x){
    if(x){
        show(t[x]);
        fout<<v[x]<<' ';
    }
}
int main()
{
    fin>>n;
    for(i=1;i<=n;i++){
        fin>>v[i];
        st=1; dr=k; pos = k+1;
        while(st<=dr){
            mid=(st+dr)/2;
            if(v[aux[mid]] >= v[i]){
                pos = mid;
                dr = mid-1;
            }else{
                st = mid+1;
            }
        }
        if(aux[pos] == 0)   k++;
        aux[pos] = i;
        dim[i] = dim[aux[pos-1]]+1;
        t[i] = aux[pos-1];
        if(maxim < dim[i]){
            maxim = dim[i];
            j = i;
        }
    }
    fout<<maxim<<'\n';
    show(j);
    return 0;
}