#include <iostream>
#include <fstream>
#include <vector>
#include <bitset>
using namespace std;

ifstream f("date.in");

typedef vector<int>::iterator iter;

int n, m;
bitset<100> viz;
vector<int> G[100];

void dfs(int nd) {
    if (viz[nd] == true) {
        return;
    }
    viz[nd] = true;

    cout << nd << ' ';
    for (iter it = G[nd].begin(); it != G[nd].end(); it++) {
        dfs(*it);
    }
}

int main()
{
    f >> n >> m;
    for (int i = 1; i <= m; i++) {
        int x, y;
        f >> x >> y;
        G[x].push_back(y);
        G[y].push_back(x);
    }

    for (int i = 1; i <= n; i++) {
        dfs(i); cout << endl;
    }

    f.close();
    return 0;
}