import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int h = sc.nextInt();
		int w = sc.nextInt();
		int[] arr = new int[h * w];
		for (int i = 0; i < h * w; i++) {
		    arr[i] = sc.nextInt();
		}
		Arrays.sort(arr);
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < h * w; i++) {
		    if (i % w > 0) {
		        sb.append(" ");
		    }
		    sb.append(arr[i]);
		    if (i % w == w - 1) {
		        sb.append("\n");
		    }
		}
		System.out.print(sb);
	}
}