#include <bits/stdc++.h>

using namespace std;
ifstream in("scmax.in");
ofstream out("scmax.out");
int v[100005],sir[100005],dp[100001];
int main()
{
    int n,i,j=0;
    in>>n;
    for(i=1;i<=n;++i)
        in>>v[i];
    sir[++j]=v[1];
    dp[1]=1;
    for(i=2;i<=n;++i)
    {
        if(v[i]>sir[j]){

            sir[++j]=v[i];
            dp[i]=j;
        }
        else{
            int st=1;
            int dr=j;
            int ans=1;
            while(st<=dr){
                int mid=(st+dr)/2;
                if(v[i]>sir[mid])
                    st=mid+1;
                else{
                    ans=mid;
                    dr=mid-1;
                }
            }
            sir[ans]=v[i];
            dp[i]=ans;
        }
    }
    out<<j<<'\n';
    j=1;
    for(i=1;i<=n;++i)
        if(dp[i]==j){
            out<<v[i]<<" ";
            ++j;
        }
    return 0;
}