#include <iostream>
#include <fstream>

using namespace std;

long v[100001], q[100001], n, l=0;
ifstream fin("scmax.in"); ofstream fout("scmax.out");

int main(){
    int i, j, ok;
    fin>>n;
    for(i=1; i<=n; i++){fin>>v[i]; ok=0;
        for(j=1; j<=l; j++)
            if(q[j]>=v[i]){q[j]=v[i];
                            ok=1;
                            break;}
        if(!ok)q[++l]=v[i];}
    fout<<l<<"\n";
    for(i=1; i<=l; i++)
        fout<<q[i]<<" ";
    fin.close(); fout.close();
    return 0;}