#include<cstdio>
int n,i,j,p,u,mid,nr,nn,a,v[100100],x[100100],sol[100100],t[100100];
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;
    t[1]=-1;
    nr=1;
    for(i=2;i<=n;i++){
        p=1;
        u=nr;
        while(p<=u){
            mid=(p+u)/2;
            if(v[i]>v[ x[mid] ])
                p=mid+1;
            else
                u=mid-1;
        }
        x[p]=i;
        t[ x[p] ]=x[p-1];
        if(p>nr)
            nr=p;
    }
    fprintf(g,"%d\n",nr);
    a=x[nr];
    while(t[a]!=-1){
        sol[++nn]=v[a];
        a=t[a];
    }
    sol[++nn]=v[a];
    for(i=nn;i>=1;i--){
        fprintf(g,"%d ",sol[i]);
    }
    fclose(f);
    fclose(g);
    return 0;
}