#include <bits/stdc++.h>
using namespace std;
int main() {
  cin.tie(NULL);
  ios::sync_with_stdio(false);
  long long int n, m, i, j, k = 0, a, V11 = 0, V00 = 0, V01 = 0, key = 0,
                            key2 = 0;
  cin >> n >> m;
  for (i = 0; i < n; i++) {
    for (j = 0; j < m; j++) {
      cin >> a;
      if (a % 10 == 0 && a / 10 == 0)
        V00++;
      else if (a % 10 == 1 && a / 10 == 1)
        V11++;
      else
        V01++;
    }
  }
  for (i = 0; i < n; i++) {
    key2 = 0;
    if (V11 == 0) key = 1;
    for (j = 0; j < m; j++) {
      if (key == 0) {
        if (V11 > 0) {
          cout << "11 ";
          V11--;
        } else if (V01 > 0) {
          if (k == 0)
            cout << "01 ";
          else
            cout << "10 ";
          V01--;
          key2 = 1;
        } else {
          cout << "00 ";
          V00--;
        }
      } else {
        if (V00 > 0) {
          cout << "00 ";
          V00--;
        } else if (V01 > 0) {
          key2 = 1;
          if (k == 0)
            cout << "01 ";
          else
            cout << "10 ";
          V01--;
        }
      }
    }
    if (key2) k = (k + 1) % 2;
    cout << endl;
  }
  return 0;
}
