#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long int ll;
typedef pair<int,int> P;
#define yn {puts("YES");}else{puts("NO");}
#define MAX_N 200005

int main() {
    int h, w;
    cin >> h >> w;
    int f[10] = {};
    rep(i,h*w){
        int a;
        cin >> a;
        f[a]++;
    }
    int now = 0;
    rep(i,h){
        rep(j,w){
            while(f[now]==0)now++;
            cout << now;
            f[now]--;
            if(j == w - 1) cout << endl;
            else cout << ' ';
        }
    }
    return 0;
}