#include <bits/stdc++.h>
using namespace std;
using ll = long long int;
int main(){
    ll N,M;
    cin >> N >> M;
    for(ll i = 0;i < M;i++){
        ll a,b;
        cin >> a >> b;
        if(a != 1 && b != 1){
            cout << -1 << endl;
            return 0;
        }
    }
    for(ll i = 0;i < N;i++){
        cout << "1" << " \n"[i == N - 1];
    }
}