#include <bits/stdc++.h>
using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  int N, K;
  cin >> N >> K;

  vector<string> d(N);
  for (int i = 0; i < N; ++i) cin >> d[i];

  mt19937 rng(123456789);

  vector<pair<int, int>> ans;

  for (int v = 9; v >= 1 && (int)ans.size() < K; --v) {
    vector<pair<int, int>> cells;

    for (int i = 0; i < N; ++i) {
      for (int j = 0; j < N; ++j) {
        if (d[i][j] - '0' == v) {
          cells.emplace_back(i, j);
        }
      }
    }

    shuffle(cells.begin(), cells.end(), rng);

    for (auto [i, j] : cells) {
      if ((int)ans.size() == K) break;
      ans.emplace_back(i, j);
    }
  }

  cout << ans.size() << '\n';
  for (auto [i, j] : ans) {
    cout << i << ' ' << j << '\n';
  }

  return 0;
}