#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;
}
int h=log2(n)+2;
cout<< h<<endl;
for(int i=h-1;i>=0;i--){
int k= min((1<<i),n) ;
for(int j=0;j<n;j++){
cout<< j/k+1 <<" ";
}
cout<<endl;
}
}
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