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#include <bits/stdc++.h>
#define NMAX 100500
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int q[NMAX];
int bin(int a)
{
int st=1, dr=q[0], mij;
while(st!=dr)
{
mij=(st+dr)/2;
if(q[mij]>=a)
dr=mij;
else st=mij+1;
}
if(q[st]<=a)
++st;
return st;
}
int n,v[NMAX], p[NMAX], poz, ans[NMAX];
int main()
{
fin>>n;
for(int i=1;i<=n;++i)
{
fin>>v[i];
if(v[i]>q[q[0]])
{
q[++q[0]]=v[i];
p[i]=q[0];
}
else
{
poz=bin(v[i]);
q[poz]=v[i];
p[i]=poz;
}
}
fout<<q[0]<<'\n';
poz=q[0];
for(int i=n;i>=1;--i)
if(p[i]==poz)
ans[poz--]=v[i];
for(int i=1;i<=q[0];++i)
fout<<ans[i]<<" ";
return 0;
}