package src;

import java.util.*;
public class A{
	static Scanner s = new Scanner(System.in);
	public static void main(String[] args) {
		int sum=0,n=s.nextInt(),d=s.nextInt(),k=s.nextInt();
		int[] r=new int[k];
		for(int i=0;i<k;i++) {
			sum+=i+1;
			r[i]=i+1;
		}
		if(sum>d) {
			System.out.println(-1);
			return;
		}
		for(int i=0;i<k;i++) {
			System.out.println(Arrays.toString(r).replaceAll("[^0-9,]", "").replaceAll(",", " "));
			sum-=r[r.length-1-i];
			r[r.length-1-i]=Math.min(d-sum, n-i);
			sum+=Math.min(d-sum, n-i);
		}
		if(sum==d) {
			System.out.println(Arrays.toString(r).replaceAll("[^0-9,]", "").replaceAll(",", " "));
		}else {
			System.out.println(-1);
		}
	}
}