#define _USE_MATH_DEFINES
#include  <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
#include<math.h>
#include<iomanip>
#include<stdio.h>
#include <stdlib.h>
#include<stdio.h>
#include <queue>
#include<map>
#include <fstream>
#include <sstream>
#include<set>
#include<stack>
#include<time.h>
#include <sys/types.h>
#include <tuple>
#include <numeric>
#include <iterator>

typedef long long int ll;
//#include<bits/stdc++.h>


using namespace std;





int main()
{

    int Q;
    Q = 1;
    //cin >> Q;


    while (Q--) {
        int a, b;
        cin >> a >> b;
        vector<int>x(a * b);
        int t = 0;
        for (int i = 0; i < a; i++) {
            for (int j = 0; j < b; j++)cin >> x[b*i + j];
        }
        sort(x.begin(), x.end());
        for (int i = 0; i < a; i++) {
            for (int j = 0; j < b; j++)cout << x[i * b + j] << " ";
            cout << endl;
        }
    }
    return 0;
}