#include <bits/stdc++.h>

using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n;
long long a[100005],d[100005];
int main()
{
    fin>>n;
    for(int i=1;i<=n;++i)
        fin>>a[i];
    int k=1;
    d[k]=a[1];
    for(int i=2;i<=n;++i)
    {
        if(a[i]>d[k])d[++k]=a[i];
        else{
            int st=1,dr=k,caut=k+1;
            while(st<=dr)
            {
                int mij=(st+dr)/2;
                if(d[mij]>a[i])
                {
                    caut=mij;
                    dr=mij-1;
                }
                else st=mij+1;
            }
        d[caut]=a[i];
        }
    }
    fout<<k<<'\n';
    for(int i=1;i<=k;++i)
    fout<<d[i]<<' ';
    fout<<'\n';
    return 0;
}