#include<cstdio>
FILE *fin,*fout;
int n,m,no[1000][100];
int num=0;
int dfs(int i,int mi,int s,int *a)
{
	if(i==m-1&&s>=mi)
	{
		for(int j=1;j<=m-1;j++)
			no[num+1][j]=a[j];
		no[num+1][m]=s;
		num++;
		return 0;
	}
	for(int j=mi;j<=s;j++)
	{
		a[i+1]=j;
		dfs(i+1,j,s-j,a);
	}
	return 0;
}
int main()
{
	fin=fopen("dataa.in","rb");
	fout=fopen("dataa.out","wb");
	fscanf(fin,"%d%d",&n,&m);
	int *a=new int[100];
	dfs(0,1,n,a);
	fprintf(fout,"%d\n",num);
	for(int i=1;i<=num;i++)
	{
		for(int j=1;j<=m-1;j++)
			fprintf(fout,"%d ",no[i][j]);
		fprintf(fout,"%d\n",no[i][m]);
	}
	return 0;
}