#include 
#include 
#include 
#include 
using namespace std;
struct node{
int idx;
node(){

}
node(int _idx){
idx=_idx;
}
bool operator <(const node &tmp) const{
    return idx > tmp.idx;
}

};
int main()
{
    int n;
    int m;
    cin>>n>>m;
    vectorgraph[n+5];
    for(int i=0; i>a>>b;
        graph[a].push_back(b);
        graph[b].push_back(a);
    }

    int s=1;
    bool niza[n+5];
    for(int i=0; i<=n; i++){
        niza[i]=false;
    }
    niza[s]=true;
    priority_queuepq;
    pq.push(node(s));
    while(!pq.empty()){
        node c=pq.top();
        cout << c.idx << " ";
        pq.pop();
        niza[c.idx]=true;
        for(int i=0; i < graph[c.idx].size(); i++){
        int sosed=graph[c.idx][i];
        if(niza[sosed]==false){
        pq.push(node(sosed));
        niza[sosed]=true;
        }
        }
    }

    return 0;
}