#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
void dk(	vector<vector<int>>& adj, int u, int v){
	adj[u].push_back(v);
		adj[v].push_back(u);
}
int main() {
	int V;
	cin>>V;
	vector<vector<int>> adj(V);
	int k,l,m;
	cin>>k;
	for(int j=0; j<k; j++){
		cin>>l>>m;
		dk(adj ,l ,m);
	}
 
	for(int i=0; i<V; i++){
		sort(adj[i].begin(), adj[i].end());
		for(int ne : adj[i])
		cout<<ne<<" ";
		cout<<endl;
	}
 
 
 
 
	return 0;
}

I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8dmVjdG9yPgojaW5jbHVkZSA8YWxnb3JpdGhtPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwp2b2lkIGRrKAl2ZWN0b3I8dmVjdG9yPGludD4+JiBhZGosIGludCB1LCBpbnQgdil7CglhZGpbdV0ucHVzaF9iYWNrKHYpOwoJCWFkalt2XS5wdXNoX2JhY2sodSk7Cn0KaW50IG1haW4oKSB7CglpbnQgVjsKCWNpbj4+VjsKCXZlY3Rvcjx2ZWN0b3I8aW50Pj4gYWRqKFYpOwoJaW50IGssbCxtOwoJY2luPj5rOwoJZm9yKGludCBqPTA7IGo8azsgaisrKXsKCQljaW4+Pmw+Pm07CgkJZGsoYWRqICxsICxtKTsKCX0KCglmb3IoaW50IGk9MDsgaTxWOyBpKyspewoJCXNvcnQoYWRqW2ldLmJlZ2luKCksIGFkaltpXS5lbmQoKSk7CgkJZm9yKGludCBuZSA6IGFkaltpXSkKCQljb3V0PDxuZTw8IiAiOwoJCWNvdXQ8PGVuZGw7Cgl9CgoJCgkKCglyZXR1cm4gMDsKfQ==

NSA3CjEgMgoyIDMKNCAxCjAgNAowIDIKMCAzCjIgMQ==

5 7
1 2
2 3
4 1
0 4
0 2
0 3
2 1