#include <bits/stdc++.h>
#define NM 100010
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int v[NM],p[NM],sol[NM],solfinal[NM],i,j,n,st,dr,mij,k,gasit;
int main()
{
    fin>>n;
    for(i=1;i<=n;i++)
        fin>>v[i];
    sol[1]=v[1];
    k=1;
    p[1]=1;
    for(i=2;i<=n;i++)
        if(v[i]>sol[k])
        {
            sol[++k]=v[i];
            p[i]=k;
        }
        else
        {
            st=1;
            dr=k;
            gasit=k+1;
            while(st<=dr)
            {
                mij=(st+dr)/2;
                if(sol[mij]>=v[i])
                {
                    gasit=mij;
                    dr=mij-1;
                }
                else
                    st=mij+1;
            }
            sol[gasit]=v[i];
            p[i]=gasit;
        }
    i=n;
    for(j=k;j>=1;j--)
    {
        while(p[i]!=j)
            i--;
        solfinal[j]=v[i];
    }
    fout<<k<<'\n';
    for(i=1;i<=k;i++)
        fout<<solfinal[i]<<" ";
    return 0;
}