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

int main() {
  int n, k;
  cin >> n >> k;
  vector<string> d(n);
  for (auto &row : d) cin >> row;
  const int line = 24;
  vector<pair<int, int>> cuts;
  for (int i = 0; i < n; i++)
    for (int j = 0; j < n; j++)
      if ((i == line || j == line) && d[i][j] != '0') cuts.emplace_back(i, j);
  printf("%d\n", (int)cuts.size());
  for (auto [i, j] : cuts) printf("%d %d\n", i, j);
}