#include <stdio.h>
int a[510][510];
int main()
{
	int n,m,i,j,u,v,n1,k;
	while (scanf("%d %d",&n,&m)&&n)
	{
		for (i=0;i<=n;i++)
			for (j=1;j<=n;j++)
			{
				if (i==0) a[i][j]=1;
				else a[i][j]=0;
			}
		for (i=0;i<m;i++)
		{
			scanf("%d %d",&u,&v);
			a[u][v]++;
		}
		n1=n;
		while (n1--)
		{
			for (i=1;i<=n;i++)
			{
				if (a[0][i]==1)
				{
					for (j=1;j<=n;j++)
						if (a[j][i]!=0) break;
				}
				if ((j==n+1)&&(a[0][i]==1)) 
				{
					a[0][i]=0;
					for (k=1;k<=n;k++)
					{
						if (a[i][k]!=0)
							a[i][k]--;
					}
					if (n1>0) printf("%d ",i);
					else printf ("%d\n",i);
					break;
				}
			}
		}
	}
	return 0;
}
/**************************************************************
	Problem: 2226
	User: admin
	Language: C
	Result: Accepted
	Time:170 ms
	Memory:2160 kb
****************************************************************/