#include <bits/stdc++.h>
#pragma GCC optimize("O3")

#define fi first
#define se second
#define vi vector<int>
#define vpi vector<pair<int,int>>
#define vll vector<ll>
#define vpll vector<pair<ll,ll>>

#define si(v) int((v).size())
#define all(v) (v).begin(), (v).end()
#define rep(i, n) for (ll i = 0; i < (ll)(n); ++i) 
#define rep2(i, n, m) for (ll i = n; i <= (ll)(m); ++i)
#define rep3(i, n, m) for (ll i = n; i >= (ll)(m); --i)

template<class T, class U> void chmax(T &a, U b) { if (a < b) a = b; }
template<class T, class U> void chmin(T &a, U b) { if (a > b) a = b; }

using ll = long long;
using ld = long double;
using namespace std;

constexpr ll MOD = 1000000007;

signed main()
{
  cout << fixed << setprecision(20);
  ios::sync_with_stdio(false);
  cin.tie(0);

  int h, w; cin >> h >> w;
  vi a(h*w);

  rep(i, h*w) cin >> a[i];
  sort(all(a));
  rep(i, h*w) {
    if (i != 0 && i % w == 0) cout << endl;
    else if (i != 0) cout << " ";
    cout << a[i];
  }
  cout << endl;

  return (0);
}