#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m;
  cin >> n >> m;
  int larger = n;
  if (larger < m) larger = m;
  if (n > m) {
    cout << n + (m - 1) << endl;
    for (int i = 1; i <= n; i++) {
      cout << i << " " << 1 << endl;
    }
    for (int i = 2; i <= m; i++) cout << 2 << " " << i << endl;
  } else {
    cout << m + (n - 1) << endl;
    for (int i = 1; i <= m; i++) {
      cout << 1 << " " << i << endl;
    }
    for (int i = 2; i <= n; i++) cout << i << " " << 2 << endl;
  }
  return 0;
}
