#include <bits/stdc++.h>
using namespace std;
int n,d,m;
int main(){
	ios::sync_with_stdio(0);
	cin>>n;
	for(d=2;n%d;d++);
	if(d==n) cout<<"-1\n",exit(0);
	m=n/d;
	if(d==2){
		cout<<m<<"\n";
		for(int i=0;i<m;i++) cout<<2*i+1<<" "<<2*n-2*i-1<<"\n";
	}
	else{
		cout<<d<<"\n";
		int c=0;
		for(int i=0;i<d;i++){
			cout<<m<<" ";
			for(int j=0;j<d;j++) cout<<2*((i+j)%d+d*j)+1<<" ";
			for(int j=d;j<m;j++) cout<<2*n-2*c-1<<" "<<2*d*d+1+2*c<<" ",c++;
			cout<<"\n";
		} 
	}
}