#include<stdio.h>
int a[100001],b[100001],p[100001],i,j,k,c,m,n,u,v;
int main() {
    freopen("scmax.in","r",stdin),freopen("scmax.out","w",stdout),scanf("%d",&n);
    for(i=1;i<=n;i++)
        scanf("%d",&a[i]);
    for(i=1;i<=n;i++) {
        if(a[b[m]]<a[i])
            p[i]=b[m],b[++m]=i;
        for(j=0,k=m;j<k;)
        if(a[b[(j+k)/2]]<a[i])
            j=(j+k)/2+1;
        else
            k=(j+k)/2;
        if(a[i]<a[b[j]]) {
            if(j)
                p[i]=b[j-1];
            b[j]=i;
        }
    }
    for(u=m,v=b[m];u--;v=p[v])
        b[u]=v;
    printf("%d\n",m);
    for(i=0;i<m;i++)
        printf("%d ",a[b[i]]);
}