#include <bits/stdc++.h>
using namespace std;
int a;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int n, m;
  int count_01 = 0, count_00 = 0, count_11 = 0;
  cin >> n >> m;
  for (int i = 0; i < n; i++) {
    string a;
    getline(cin, a);
    if (a.length() == 0) getline(cin, a);
    for (int j = 0; j < a.length() - 1; j++) {
      if (a[j] == ' ' || a[j + 1] == ' ') continue;
      if (a[j] == '0' && a[j + 1] == '0')
        count_00++;
      else if (a[j] == '1' && a[j + 1] == '1')
        count_11++;
      else {
        count_01++;
      }
    }
  }
  long long int x = count_11 / m;
  for (int i = 0; i < x; i++) {
    for (int j = 0; j < m; j++) {
      if (j != m - 1)
        cout << "11 ";
      else
        cout << "11";
    }
    cout << endl;
    count_11 -= m;
  }
  x = count_00 / m;
  for (int i = 0; i < x; i++) {
    for (int j = 0; j < m; j++) {
      if (j != m - 1)
        cout << "00 ";
      else
        cout << "00";
    }
    cout << endl;
    count_00 -= m;
  }
  long int prev[m];
  memset(prev, -1, sizeof(prev));
  long int i = 1;
  if (count_11 > 0) {
    for (; i <= count_11; i++) {
      cout << "11 ";
      prev[i - 1] = 3;
    }
    count_11 = 0;
  }
  if (count_01 > 0) {
    for (; i <= m; i++) {
      cout << "01 ";
      prev[i - 1] = 0;
      count_01--;
    }
    cout << endl;
  }
  while (count_01 + count_00 > 0) {
    for (int i = 0; i < m; i++) {
      if (prev[i] == 0 && count_01 > 0) {
        cout << "10 ";
        count_01--;
        prev[i] = 1;
      } else if (prev[i] == 1 && count_01 > 0) {
        cout << "01 ";
        count_01--;
        prev[i] = 0;
      } else if (count_00 > 0) {
        cout << "00 ";
        count_00--;
        prev[i] = 3;
      } else {
        cout << "01 ";
        count_01--;
        prev[i] = 0;
      }
    }
    cout << endl;
  }
  return 0;
}
