#include <bits/stdc++.h>
#define int long long
using namespace std;
signed main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    int N,M;
    cin>>N>>M;
    if(N==M){
        cout<<N<<"\n";
        for(int i=0;i<N;i++){
            for(int j=0;j<M;j++){
                if(i==j) cout<<"1 ";
                else cout<<"0 ";
            }
            cout<<"\n";
        }
    }
    if(N>M){
        int cha=N-M;
        int num=M+cha/2;
        if(cha%2) num++;
        cout<<num<<"\n";
        for(int i=0;i<N;i++){
            for(int j=0;j<M;j++){
                if(i==j) cout<<"1 ";
                else if(i>=M&&i-M%2==0&&j==0 || cha%2&&i==N-1&&j==0) cout<<"1 ";
                else cout<<"0 ";
            }
            cout<<"\n";
        }
    }
    if(N<M){
        int cha=M-N;
        int num=N+cha/2;
        if(cha%2) num++;
        cout<<num<<"\n";
        for(int i=0;i<N;i++){
            for(int j=0;j<M;j++){
                if(i==j) cout<<"1 ";
                else if(j>=N&&j-N%2==0&&i==0 || cha%2&&j==M-1&&i==0) cout<<"1 ";
                else cout<<"0 ";
            }
            cout<<"\n";
        }
    }
    return 0;
}