#include <bits/stdc++.h>
using namespace std;
signed main() {
  ios::sync_with_stdio(false);
  long long t = 1;
  while (t--) {
    long long n, m;
    cin >> n >> m;
    long long a[n][m];
    vector<long long> r(n + 1, 0), c(m + 1, 0), m_r(n + 1, INT_MAX),
        m_c(m + 1, INT_MAX);
    long long row = INT_MAX, col = INT_MAX;
    for (long long i = 0; i < n; i++)
      for (long long j = 0; j < m; j++) cin >> a[i][j];
    for (long long i = 0; i < n; i++)
      for (long long j = 0; j < m; j++) m_r[i + 1] = min(m_r[i + 1], a[i][j]);
    for (long long i = 0; i < m; i++)
      for (long long j = 0; j < n; j++) m_c[i + 1] = min(m_c[i + 1], a[j][i]);
    vector<vector<long long> > v(n + 1, vector<long long>(m + 1, 0));
    if (n <= m) {
      for (long long i = 0; i < n; i++) {
        if (m_r[i + 1] >= 1) {
          for (long long j = 0; j < m; j++) v[i][j] += m_r[i + 1];
          r[i + 1] = m_r[i + 1];
        }
        row = min(row, m_r[i + 1]);
      }
      for (long long i = 0; i < m; i++) {
        if (row < m_c[i + 1]) {
          for (long long j = 0; j < n; j++) v[j][i] += m_c[i + 1] - row;
          c[i + 1] = m_c[i + 1] - row;
        }
      }
    } else {
      for (long long i = 0; i < m; i++) {
        if (m_c[i + 1] >= 1) {
          for (long long j = 0; j < n; j++) v[j][i] += m_c[i + 1];
          c[i + 1] = m_c[i + 1];
        }
        col = min(col, m_c[i + 1]);
      }
      for (long long i = 0; i < n; i++) {
        if (col < m_r[i + 1]) {
          for (long long j = 0; j < m; j++) v[i][j] += m_r[i + 1] - col;
          r[i + 1] = m_r[i + 1] - col;
        }
      }
    }
    for (long long i = 0; i < n; i++) {
      for (long long j = 0; j < m; j++) {
        if (v[i][j] != a[i][j]) {
          cout << -1;
          return 0;
        }
      }
    }
    long long ans = 0;
    for (long long i = 0; i < n; i++)
      if (r[i + 1] != 0) ans += r[i + 1];
    for (long long i = 0; i < m; i++)
      if (c[i + 1] != 0) ans += c[i + 1];
    cout << ans << endl;
    for (long long i = 0; i < n; i++) {
      if (r[i + 1] != 0) {
        for (long long j = 0; j < r[i + 1]; j++) {
          cout << "row " << i + 1 << endl;
        }
      }
    }
    for (long long i = 0; i < m; i++) {
      if (c[i + 1] != 0) {
        for (long long j = 0; j < c[i + 1]; j++) {
          cout << "col " << i + 1 << endl;
        }
      }
    }
  }
}
