#include<stdio.h>
FILE *g;
int n,m;
struct 
{int b[50000];
}a[50000];
char viz[50000];
void df(int k)
{int i;
	for(i=1;i<=n;i++)
	   if(a[k].b[i]==1&&viz[i]==0)
	     {fprintf(g,"%d ",i);
	     	df(i);
	     	}
	   
}
int main()
{FILE *f;
	fscanf(f,"%d %d",&n,&m);
 int i;
 for(i=0;i<m;i++) 
   {int x,y;
    fscanf(f,"%d %d",&x,&y);
    a[x].b[y]=1; 
   }
   fprintf(g,"1 ");
   df(1);
}