#include <bits/stdc++.h>

int n,v[100003],p[100003],L[100003],nr;

void afis(int i)
{
    if(p[i]>0)
        afis(p[i]);
    printf("%d ",v[i]);
}

int caut(int x)
{
    int st=1,dr=nr,ans=nr+1;
    while(st<=dr)
    {
        int m=(st+dr)/2;
        if(v[L[m]]>=x)
        {
            ans=m;
            dr=m-1;
        }
        else
            st=m+1;
    }
    return ans;
}

int main()
{
    freopen("scmax.in","r",stdin);
    freopen("scmax.out","w",stdout);

    scanf("%d",&n);
    for(int i=1;i<=n;i++)
        scanf("%d",&v[i]);

    nr=0;

    for(int i=1; i<=n; i++)
    {
        int poz=caut(v[i]);

        if(poz==1)
            p[i]=0;
        else
            p[i]=L[poz-1];

        L[poz]=i;

        if(poz>nr)
            nr=poz;
    }

    printf("%d\n",nr);
    afis(L[nr]);

    return 0;
}