#include<cstdio>
const int N=100001;
int a[N],b[N],p[N],i,j,k,m,n;
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);
        if(a[b[m]]<a[i])
            p[i]=b[m],b[++m]=i;
        for(j=0,k=m;j<k;)
        	a[b[(j+k)/2]]<a[i]?j=(j+k)/2+1:k=(j+k)/2;
        if(a[i]<a[b[j]])
			j?p[i]=b[j-1]:0,b[j]=i;
    }
    for(i=m,j=b[m];i--;j=p[j])
        b[i]=j;
    printf("%d\n",m);
    for(i=0;i<m;i++)
        printf("%d ",a[b[i]]);
}