#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
 
int main() {
 
 #if !defined(LOCAL)
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
#endif
	vector<vector <int>>linie;
	int wir,sas,  drzewo_zrodlo, drzewo_cel ;
	cin >> wir>>sas;
	linie.resize(wir+1);
	for (int i=0; i<sas; i++){
		cin >> drzewo_zrodlo >> drzewo_cel;
		linie[drzewo_zrodlo].push_back(drzewo_cel);
		linie[drzewo_cel].push_back(drzewo_zrodlo);
	}
	for(int i=1; i<wir+1; i++){
		if (linie[i].size()==0){
			cout <<"Wiewior sam!"<< endl;
		}else{
			for (int j=0; j< linie[i].size();j++) {
				cout<<linie[i][j] << " ";
			}
			cout <<endl;
		}
	}
	return 0;
}

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NSA0CjIgMwoxIDMKNSAxCjUgMw==

5 4
2 3
1 3
5 1
5 3