#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int main(void){
	// 数値の数
	int count = 0;
	scanf("%d",&count);
	// 振り分ける数
	int divide = 0;
	scanf("%d",&divide);
	// 数値
	int val[count];
	int *p = val;
	for(int i = 0;i < count;i++){
		scanf("%d",&p[i]);
	}
	printf("\n");
	// 数値のソート(降順)
	for(int i = 0;i < count;i++){
		for(int j = 0;j < count;j++){
			if (p[i] > p[j])
			{
			    int x = p[j];
			    p[j] = p[i];
			    p[i] = x;
			}
		}
	}
	
	int tmp = 0;
	if(count % divide == 0){
		tmp = count / divide;
	}else{
		tmp = (count / divide) + 1;
	}
	int array[tmp][divide];
	int k = 0;
	for(int i = 0;i < divide;i++){
		for(int j = 0;j < tmp;j++){
			array[i][j] = p[k];
			k++;
			printf("%d ",array[i][j]);
		}
		printf("\n");
	}
}