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#include <fstream>
#include <iostream>
#define nmax 200001
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n,a[nmax],b[nmax],poz[nmax],i,m,pas;
inline void read()
{
fin>>n;
for(i=1; i<=n; i++)
fin>>a[i];
fin.close();
}
int cauta(int x)
{
pas=1<<5;
int r=0;
while(pas!=0)
{
if(r+pas<=m && a[b[r+pas]]<x)
r+=pas;
pas/=2;
}
return r;
}
void write(int x)
{
if(x>0)
{
write(poz[x]);
fout<<a[x]<<' ';
}
}
inline void solve()
{
int k;
b[++m] = 1;
for(i=2; i<=n; i++)
{
poz[i]=0;
k=cauta(a[i]);
k++;
poz[i]=b[k-1];
b[k]=i;
if(k>m)
{
m=k;
}
}
}
int main()
{
read();
solve();
fout<<m<<'\n';
write(b[m]);
return 0;
}