#include <bits/stdc++.h>

using namespace std;

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

int n, m, x, y, viz[100100], st[100100], vf;
vector<int> v[100100];

void dfs(int x) {
	viz[x] = 1;
	for (auto y : v[x])
		if (!viz[y])
			dfs(y);
	st[++vf] = x;
}

int main() {
	in >> n >> m;
	for (int i = 1; i <= m; i++) {
		in >> x >> y;
		v[x].push_back(y);
		v[y].push_back(x);
	}
	
	for (int i = 1; i <= n; i++)
		if (!viz[i])
			dfs(i);
			
	for (; vf; vf--)
		out << st[vf] << ' ';
	return 0;
}