#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main()
{
    freopen("matrix.in", "r", stdin);
    freopen("matrix.out", "w", stdout);
    ios::sync_with_stdio(0);
    cin.tie(0);

    int n, m,input;
    cin >> n >> m;
    vector< vector<int >> matrix(n);
    for(int i = 0; i < n; i++)
    {
        for(int j = 0; j < m; j++)
        {
            cin >> input;
            matrix[i].push_back(input);
        }
    }
    sort(matrix.begin(),matrix.end());

    for(int i = 0; i < n; i++)
    {
        for(int j = 0; j < m; j++)
            cout << matrix[i][j] << " ";
        cout << endl;
    }
    return 0;
}