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#include <bits/stdc++.h>
using namespace std;
ifstream f ("subsir2.in");
ofstream g ("subsir2.out");
const int nmax=1e5+3;
int v[nmax],st,dr,k,t[nmax],p[nmax],n,pt,poz;
int caut(int x)
{
int st=0,dr=k,m;
while(st<=dr)
{
m=(st+dr)/2;
if(v[t[m]]<x&&v[t[m+1]]>x) return m;
else if(v[t[m+1]]<x) st=m+1;
else dr=m-1;
}
return k;
}
void afis(int x)
{
if(p[x]) afis(p[x]);
g<<v[x]<<' ';
}
int main()
{
ios::sync_with_stdio(false);
f>>n;
for(int i=1;i<=n;++i) f>>v[i];
v[0]=-10000000;
t[1]=1;
k=1;
pt=1;
for(int i=2;i<=n;++i)
{
poz=caut(v[i]);
p[i]=t[poz];
t[poz+1]=i;
if(poz+1>k)
{
k=poz+1;
pt=i;
}
}
g<<k<<'\n';
afis(pt);
return 0;
}