#include<bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define pb push_back
const int N=1e5;
signed main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n,m;
cin>>n>>m;
for(int i=1;i<=m;i++){
int a,b;
cin>>a>>b;
}
cout<<n*2<<endl;
for(int i=1;i<=n;i++){
for(int z=0;z<2;z++){
for(int j=1;j<=n;j++){
if(i<=j){
cout<<1;
}
else{
cout<<j+1;
}
cout<<" ";
}
cout<<endl;
}
}
}
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