#include<cstdio>
int n,i,v[100100],x[100100],nr,p,u,mid;
FILE *f,*g;
int main(){
    f=fopen("scmax.in","r");
    g=fopen("scmax.out","w");
    fscanf(f,"%d",&n);
    for(i=1;i<=n;i++){
        fscanf(f,"%d",&v[i]);
    }
    x[0]=-1;
    x[1]=1;
    nr=1;
    for(i=2;i<=n;i++){
        p=1;
        u=nr;
        while(p<=u){
            mid=(p+u)/2;
            if(v[x[mid]]<v[i])
                p=mid+1;
            else
                u=mid-1;
        }
        x[p]=i;
        if(p>nr)
            nr=p;
    }
    fprintf(g,"%d\n",nr);
    for(i=1;i<=nr;i++){
        fprintf(g,"%d ",v[x[i]]);
    }
    fclose(f);
    fclose(g);
    return 0;
}