#include<fstream>
#include<string.h>
#include<ctype.h>
#include<iostream>
#include<algorithm>
#include<map>
#include<unordered_map>
#include<array>
#include<deque>
#include<queue>
#include<math.h>
#include<functional>
#include<unordered_set>
#include<set>
#include<iomanip>
#include<bitset>
using namespace std;
int n, t, k, i, m, x, y,viz[50500];
vector<int>v[50500];
vector<int>rez;
vector<int>::reverse_iterator iter;
void DFS(int x)
{
	viz[x] = 1;
	for (auto it = v[x].begin(); it != v[x].end(); it++)
		if(viz[*it]==0)
		{
			DFS(*it);
		}
	rez.push_back(x);
}
int main()
{
	//ifstream f("file.in");
	//ofstream g("file.out");
	ifstream f("sortaret.in");
	ofstream g("sortaret.out");
	f >> n >> m;
	for (i = 1; i <= m; i++)
	{
		f >> x >> y;
		v[x].push_back(y);
		v[y].push_back(x);
	}
	for(i=1;i<=n;i++)
		if(viz[i]==0)
			DFS(i);
	for (iter = rez.rbegin(); iter != rez.rend(); iter++)
		g << *iter<<' ';
	return 0;
}