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#include<bits/stdc++.h>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
long long n,i,v[100010],d[100010],st,dr,mid,k,r[100010];
void afis(int k)
{
if(k==0) return;
afis(r[k]);
fout<<v[k]<<" ";
}
int main()
{
fin>>n;
for(i=1;i<=n;i++)fin>>v[i];
d[++k]=1;
for(i=2;i<=n;i++)
{
st=1;dr=k;
while(st<=dr)
{
mid=(st+dr)/2;
if(v[i]>v[d[mid]]) st=mid+1;
else dr=mid-1;
}
if(st==k+1) d[++k]=i;
else d[st]=i;
r[i]=d[st-1];
}
fout<<k<<"\n";
afis(d[k]);
return 0;
}