#include <bits/stdc++.h>
using namespace std;
int n, m;
vector<int> adj[100005];
vector<int> vis(100005, 1);
vector<int> ans;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int T = 1;
  for (int qq = 1; qq <= T; qq++) {
    cin >> n >> m;
    for (int i = 0; i < m; i++) {
      int x, y;
      cin >> x >> y;
      adj[x].push_back(y);
      adj[y].push_back(x);
    }
    priority_queue<int> v;
    v.push(-1);
    vis[1] = 0;
    while (!v.empty()) {
      int u = -v.top();
      v.pop();
      ans.push_back(u);
      for (auto i : adj[u])
        if (vis[i]) v.push(-i), vis[i] = 0;
    }
    for (auto i : ans) cout << i << ' ';
    cout << endl;
  }
  return 0;
}
