#include<bits/stdc++.h>

using namespace std;

int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int n,m;
  cin >> n >> m;
  vector<string> s(n);
  for(auto &nx : s){cin >> nx;}
  vector<pair<int,int>> vp;
  for(int i=0;i<50;i++){
    if(s[i][i]!='0'){vp.push_back({i,i});}
  }
  for(int i=0;i<50;i++){
    if(s[i][49-i]!='0'){vp.push_back({i,49-i});}
  }
  
  cout << vp.size() << "\n";
  for(auto &nx : vp){
    cout << nx.first << " " << nx.second << "\n";
  }
  return 0;
}