package main

import . "fmt"

func main() {
	var h,w int
	Scan(&h,&w)
	var t [10]int
	for i:=0;i<h*w;i++ {
		var a int
		Scan(&a)
		t[a]++
	}
	var n int
	for r:=0;r<h;r++ {
		for c:=0;c<w;c++ {
			for ;t[n]==0;n++ {}
			t[n]--
			if c>0 {
				Print(" ")
			}
			Print(n)
		}
		Println()
	}
}