#include <cstdio>
#include <algorithm>
using namespace std;
FILE *f=fopen("scmax.in","r");
FILE *g=fopen("scmax.out","w");
int N,i,lmax,dr,st,last,mid;
int M[100005],P[100005],nr[100005],rez[100005];
int main()
{
    fscanf(f,"%d",&N);
    for(i=1;i<=N;i++)
    {
        fscanf(f,"%d",&nr[i]);
        st=1;
        dr=lmax;
        last=0;
        while(st<=dr)
        {
            mid=(st+dr)/2;
            if(nr[M[mid]]<nr[i])
            {
                last=mid;
                st=mid+1;
            }
            else
                dr=mid-1;
        }
            P[i]=M[last];
        if(last+1>lmax)
        {
            lmax=last+1;
            M[lmax]=i;
        }
        else if(nr[M[last+1]]>nr[i])
            M[last+1]=i;
    }
    fprintf(g,"%d\n",lmax);
    for(i=M[lmax];i>0;i=P[i])
        rez[++rez[0]]=nr[i];
    for(i=rez[0];i>0;i--)
        fprintf(g,"%d ",rez[i]);
    fclose(f);
    fclose(g);
    return 0;
}