#pragma GCC optimize(3,"Ofast","inline")
#pragma GCC optimize(2)
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define pb push_back
#define all(x) x.begin(),x.end()
#define rep(i,a,b) for(ll i=a;i<=b;++i)
#define per(i,a,b) for(ll i=a;i>=b;--i)
typedef pair<ll,ll> pll;
const ll N=4e5+5;
ll n,m;
int	 main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
	int t=1;
	//cin>>t;
	while(t--)
    {
        cin>>n>>m;
        cout<<(n+m+1)/2<<"\n";
        rep(i,1,n)
        {
            rep(j,1,m)cout<<((((i-j+m)&1)|(i-j==n-1))&(min(i,j)==1));
            cout<<"\n";
        }
    }
}
/*
1
3 2
10 10 5
1 2
1 3
3 2
10 10 5
1 2
1 3
*/