#define _CRT_SECURE_NO_WARNINGS
#include <fstream>
#include <iostream>

using namespace std;

ifstream fin ("sortaret.in");
ofstream fout("sortaret.out");

int nod_nb, arc_nb;

int dfs(int level, int nod, int** legaturi, int* solutie)
{
	solutie[level] = nod;
	for (int i = 1; i <= nod_nb; i++)
		if (legaturi[nod][i])
			level = dfs(level + 1, i, legaturi, solutie);
	return level;
}

int main()
{
	fin >> nod_nb >> arc_nb;
	int* solutie;
	solutie = (int*)malloc(sizeof(int) * (nod_nb + 1));
	int** legaturi;
	legaturi = (int**)malloc(sizeof(int*) * (nod_nb + 1));
	for (int i = 0; i <= nod_nb; i++)
		*(legaturi + i) = (int*)malloc(sizeof(int) * (nod_nb + 1));
	for (int i = 0; i <= nod_nb; i++)
		for (int j = 0; j <= nod_nb; j++)
			legaturi[i][j] = 0;
	while (arc_nb--)
	{
		int parent, son;
		fin >> parent >> son;
		legaturi[parent][son] = 1;
	}
	dfs(1, 1, legaturi, solutie);
	/*FILE* fout = fopen("sort.out", "w");
	if (fout == NULL)
		cout << "null fout\n";*/
	for (int i = 1; i <= nod_nb; i++)
	{
		fout << solutie[i] << ' ';
		/*printf("%d ", solutie[i]);
		fprintf(fout, "%d ", solutie[i]);*/
	}
	return 0;
}