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#include<fstream>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int n,v[1000001],ns,sol[1000000],a[1000001];
void citire()
{
f>>n;
for(int i=1;i<=n;++i)
f>>v[i];
}
void afis(int k)
{
for(int i=1;i<=k;++i)
sol[i]=a[i];
ns=k;
}
bool verif(int k)
{
if(v[a[k]]<=v[a[k-1]])
return 0;
return 1;
}
void bt(int k)
{
if (k-1>ns) afis(k-1);
for(int i=a[k-1]+1;i<=n;++i)
{
a[k]=i; if(verif(k)) bt(k+1);
}
}
int main()
{
citire(); bt(1); g<<ns<<endl;
for(int i=1;i<=ns;++i)
g<<v[sol[i]]<<" ";
}