#include<bits/stdc++.h>

using namespace std;
using pi=pair<int,int>;

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<vector<pi>> l1(2*n+5),l2(2*n+5);
  for(int i=0;i<n;i++){
    for(int j=0;j<n;j++){
      l1[i+j].push_back({i,j});
      l2[i+n-j].push_back({i,j});
    }
  }

  vector<pair<int,pi>> cand;
  for(auto &nx : l1[40]){
    cand.push_back({s[nx.first][nx.second],nx});
  }
  for(auto &nx : l2[40]){
    cand.push_back({s[nx.first][nx.second],nx});
  }
  for(auto &nx : l1[60]){
    cand.push_back({s[nx.first][nx.second],nx});
  }
  for(auto &nx : l2[60]){
    cand.push_back({s[nx.first][nx.second],nx});
  }

  vector<pi> vp;
  sort(cand.rbegin(),cand.rend());
  for(auto &nx : cand){
    if(vp.size()>=m){break;}
    if(s[nx.second.first][nx.second.second]>'0'){
      s[nx.second.first][nx.second.second]='0';
      vp.push_back(nx.second);
    }
  }

  cout << vp.size() << "\n";
  for(auto &nx : vp){
    cout << nx.first << " " << nx.second << "\n";
  }
  return 0;
}