#include<bits/stdc++.h>
#define Yukinoshita namespace
#define Yukino std
using Yukinoshita Yukino;
int read()
{
	int s=0,w=1;
	char ch=getchar();
	while(ch<'0'||ch>'9') w=ch=='-'?-1:1,ch=getchar();
	while(ch>='0'&&ch<='9') s=s*10+ch-'0',ch=getchar();
	return s*w;
}
const int mxn=1e5+5;
vector<int> res[mxn];
using ll=long long;
ll sum[mxn];
int main()
{
	int n=read(),i,j,p;
	if(n==2) return cout<<-1,0;
	if(n%2==0)
	{
		cout<<n/2<<endl;
		for(i=1,j=n*2-1;i<=j;i+=2,j-=2)
			cout<<2<<' '<<i<<' '<<j<<endl;
		return 0;
	}
	bool fl=0;
	for(p=2;p*p<=n;p++)
		if(n%(p*p)==0)
		{
			fl=1;
			break;
		} 
	if(!fl) return cout<<-1,0;
	printf("%d\n",n/p);
	for(i=1;i<=n;i+=p)
	{
		printf("%d ",p);
		for(j=0;j<p;j++)
			printf("%d ",((j+i/p)%p+i)*2-1);
		puts("");
	}
}