#include <bits/stdc++.h>
using namespace std;
const long long INF = 1e10;
const int inf = 1e9, dx[] = {0, 0, 1, -1, 1, -1, 1, -1},
          dy[] = {1, -1, 0, 0, 1, 1, -1, -1};
long long MOD = 1e9 + 7;
long double eps = 1e-7, pi = acos(-1);
int n, m, w;
int main() {
  ios_base::sync_with_stdio(0);
  cin >> n >> m;
  w = min(n, m);
  cout << w + 1 << "\n";
  for (int i = 0; i <= w; i++) cout << i << " " << w - i << "\n";
  return 0;
}
