#include <fstream>
#include <vector>

using namespace std;

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

int n, m, x, y, p, nr;
vector <int> v[50005];
int viz[50005];


void dfs(int h)
{
	int i;
	viz[h] = 1;
	fout << h << " ";
	for (i = 0; i < v[h].size(); i++)
	{
		if (!viz[v[h][i]])
		{
			fout << v[h][i] << " ";
			dfs(v[h][i]);
	    }
	}
}

void Citire()
{
	fin >> n >> m;
	for (int i = 1; i <= m; i++)
	{
		fin >> x >> y;
		v[x].push_back(y);
	}
}

void Rezolvare()
{
	
	for (int i = 1; i <= n; i++)
		if (!viz[i])dfs(i);

}


int main()
{
	Citire();
	Rezolvare();
}