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#include<bits/stdc++.h>
using namespace std;
long long suma,a,n,zmienna,szukana;
int odw[1000010];
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(NULL);
cin>>n;
for(int i=1;i<=n;i++)
{
cin>>a;
odw[a]++;
}
if(odw[1]==0)
{
cout<<2<<endl;
cout<<2<<endl;
cout<<1<<" "<<2<<endl;
}
if(odw[1]==1)
{
cout<<1<<endl;
cout<<2<<endl;
cout<<1<<" "<<2<<endl;
}
if(odw[1]>=2)
{
cout<<0<<endl;
cout<<2<<endl;
cout<<1<<" "<<2<<endl;
}
return 0;
}