#include <iostream>
#include <limits.h>
using namespace std;

int main() {
	int index = 0, min = 0, n = 0, m = 0;
	cin >> n;
	cin >> m;

	int** mas = new int*[n];
	for (int i = 0; i < n; i++) {
		mas[i] = new int[m];
		for (int j = 0; j < m; j++) {
			cin >> mas[i][j];
		}
	}

	 for (int i = 0; i < n; i++) {
		min = INT_MAX;
		for (int j = i; j < m; j++) {
			if (mas[i][j] < min) {
				min = mas[i][j];
				index = j;
			}
		}
		for (int j = index; j >= i; j--) {
			mas[j] = mas[j - 1];
		}
		for (int j = 0; j < m ; j++)
			mas[i][j] = min;
	}

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