#include <iostream>
#include<bits/stdc++.h>
using namespace std;
 
 
void dfs(vector<bool>vis,vector<vector<int>>adjlist,int curr,vector<int>parent){
	vis[curr]=true;
 
	for(int adj : adjlist[curr]){
		if(!vis[adj]){
			vis[adj]=true;
			parent[adj]=curr;
			dfs(vis,adjlist,adj,parent);
		}
	}
	cout<<curr<<" ";
}
int main() {
    int n ; int m ; 
    cin>>n>>m;
    vector<vector<int>>adjlist(n+1);
    vector<bool>vis(n+1,false);
    vector<int>parent(n+1,-1);
    for(int i = 0 ; i<m;i++){
    	int u ; int v ; 
    	cin>>u>>v;
    	adjlist[u].push_back(v);
    	adjlist[v].push_back(u);
    }
    dfs(vis,adjlist,1,parent);
	return 0;
}

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1 5 
5 6 
6 9 
1 2 
2 7 
2 8 
1 3 
3 4