#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct nod
{
	int ascend;
	nod *next;
};

int N,precedenti[50012],vizitat[50012];
nod *ASC[50012];

void citeste_fisier();
void parcurgere();
bool verif_term();
nod *constructie(int info);
void insert_nod(int sursa,int dest);
void descreste_el(int el);

int main()
{
	citeste_fisier();
	parcurgere();
	return 0;
}

void parcurgere()
{
	FILE *g = fopen("sortaret.out","w");

	int i,j,k;
	//while ( verif_term() == false )
	{
		for(i=0;i<N;i++)
		{
			if ( precedenti[i] == 0 && vizitat[i] == 0 )
			{
				vizitat[i] = 1;
				fprintf(g,"%d ",i+1);
				descreste_el(i);
				/*
				for(j=0;j<N;j++)
				{
					if ( adiac[i][j] == 1 )
						precedenti[j]--;
				}
				*/
			}
		}
	}

	fclose(g);
}

void descreste_el(int el)
{
	nod *p = ASC[el];
	while ( p != 0 )
	{
		precedenti[p->ascend]--;
		p = p->next;
	}
}

bool verif_term()
{
	for(int i=0;i<N;i++)
		if ( vizitat[i] == 0 )
			return false;
	return true;
}

void citeste_fisier()
{
	FILE *f = fopen("sortaret.in","r");
	if ( f == 0 )
		return;
	int M,a,b;
	fscanf(f,"%d %d",&N,&M);
	for(int i=0;i<M;i++)
	{
		fscanf(f,"%d %d",&a,&b);
		precedenti[b]++;
		insert_nod(a,b);
		//adiac[a][b] = 1;
	}

	fclose(f);
}

void insert_nod(int sursa,int dest)
{
	nod *p = ASC[sursa];
	nod *c = constructie(dest);

	if ( p == 0 )
	{
		ASC[sursa] = c;
		return;
	}

	ASC[sursa] = c;
	ASC[sursa]->next = p;

}

nod *constructie(int info)
{
	nod *p = (nod *)malloc(sizeof(nod));
	p->ascend = info;
	p->next = 0;
	return p;
}