#include <stdio.h>
int v[100000],s[100000];
int main(){
    FILE *fin=fopen("scmax.in","r");
    FILE *fout=fopen("scmax.out","w");
    int n,i,t,poz,st,dr,mij;

    fscanf(fin,"%d",&n);
    fscanf(fin,"%d",&v[0]);
    s[0]=v[0];
    t=1;
    for(i=1; i<n; i++){
        fscanf(fin,"%d",&v[i]);
        poz=mij=-1;
        st=0;
        dr=t-1;
        while(st<=dr){
            mij=(st+dr)/2;
            if(s[mij]>=v[i]){
                poz=mij;
                dr=mij-1;
            }else
                st=mij+1;
        }
        if(poz==-1){
            s[t]=v[i];
            t++;
        }else
            s[poz]=v[i];
    }
    fprintf(fout,"%d\n",t);
    for(i=0; i<t; i++)
        fprintf(fout,"%d ",s[i]);
    fclose(fin);
    fclose(fout);
    return 0;
}