#include "bits/stdc++.h"

using namespace std;

int main() {

  cin.tie(0)->sync_with_stdio(0);
  cin.exceptions(cin.failbit);

  int n, m; cin >> n >> m;

  cout << max(n, m) << "\n";

  vector<vector<int>> ans(n, vector<int>(m));

  if (n >= m) {
    int ci = 0;
    int chg = 1;
    for (int i = 0; i < n; i++) {
      ans[i][ci] = 1;
      ci += chg;

      if (ci == m || ci == -1) {
        chg *= -1;
        ci += chg;
      }
      
    }
  }
  else {
    int ci = 0;
    int chg = 1;
    for (int i = 0; i < m; i++) {
      ans[ci][i] = 1;
      ci += chg;
      if (ci == n || ci == -1) {
        chg *= -1;
        ci += chg;
      }
    }
  }

  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      cout << ans[i][j] << " \n"[j == m - 1];
    }
  }

}