#include<iostream>
#include<cstdio>
using namespace std;
int n,m,tot;
int ans[1000][11];
int now[11];
void work(int i,int j,int he)
{
	int k;
	if ((i==m)&&(n-he>=now[i-1]))
	  {
	  	tot++; now[i]=n-he;
	    for (i=1;i<=m;++i)
	      ans[tot][i]=now[i];
	    return;
	  }
	for (k=j;k<=n-i;++k)
	  {
	    now[i]=k;
	    work(i+1,k,he+k);
	    now[i]=0;
      }
}
int main()
{
	int i,j;
	freopen("dataa.in","r",stdin);
	freopen("dataa.out","w",stdout);
	scanf("%d%d",&n,&m);
	tot=0; work(1,1,0);
	cout<<tot<<endl;
	for (i=1;i<=tot;++i)
	  {
	    for (j=1;j<=m;++j)
	      cout<<ans[i][j]<<' ';
	    cout<<endl;
      }
    fclose(stdin);
    fclose(stdout);
}