#include <bits/stdc++.h>
using namespace std;

using i64 = long long;

int main() {
    cin.tie(nullptr)->sync_with_stdio(false);

    auto solve = [&]() {
        int n, m;
        cin >> n >> m;

        cout << (n + m + 1) / 2 << '\n';

        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                int res = (i == 0 || j == m - 1) && ((i + j) % 2 == 0 || i + j == n + m - 2);
                cout << res << " \n"[j + 1 == m];
            }
        }
    };
    
    solve();
    
    return 0;
}