#pragma GCC optimize("O3")
//#pragma GCC target("avx2")
//#pragma GCC optimize("unroll-loops")

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ld> vld;
typedef pair<ll,ll> Pll;
typedef pair<int,int> Pin;

ll INF = 1e16;
int inf = 1e9;

#define ALL(x) (x).begin(), (x).end()
#define FOR(i, m, n) for (ll i = (m); i < (n); ++i)
#define REVFOR(i, m, n) for (ll i = (n - 1); i >= (m); --i)
#define REP(i, n) FOR(i, 0, n)
#define REVREP(i, n) REVFOR(i, 0, n)
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define bcnt __builtin_popcountll

#ifdef LOCAL
#include <prettyprint.hpp>
#define debug(...)  cerr << "[" << #__VA_ARGS__ << "]: ", d_err(__VA_ARGS__);
#else
#define debug(...) 83;
#endif

void d_err() {
    cerr << endl;
}

template <typename H, typename... T>
void d_err(H h, T... t) {
    cerr << h << " ";
    d_err(t...);
}

template <typename T>
void print(T x) {
    cout << x << "\n";
}

template <typename T>
void print(vector<T>& x) {
    int N = x.size();
    REP(i, N) {
        if (i > 0) cout << " ";
        cout << x[i];
    }
    cout << "\n";
}

int main(){
    cin.tie(0);
    ios_base::sync_with_stdio(false);
    cout << fixed << setprecision(20);


    int n, m; cin >> n >> m;
    vll ans(n + 1, -1);
    vll a(m), b(m), y(m);
    REP(i, m) {
        cin >> a[i] >> b[i];
        cin >> y[i];

        if (ans[a[i]] == -1 && ans[b[i]] == -1) {
            ans[a[i]] = 0;
            ans[b[i]] = y[i] ^ ans[a[i]];
        } else {
            if (ans[a[i]] == -1) {
                ans[a[i]] = ans[b[i]]^y[i];
            } else if (ans[b[i]] == -1) {
                ans[b[i]] = ans[a[i]]^y[i];
            } else {
                if ((ans[a[i]] ^ ans[b[i]]) != y[i]) {
                    print(-1);
                    return 0;
                }
            }
        }
    }

    REP(i, m) {
        if ((ans[a[i]] ^ ans[b[i]]) != y[i]) {
            print(-1);
            return 0;
        }
    }

    bool first = true;
    for(auto &e: ans) {
        if (first) {
            first = false;
            continue;
        }

        if (e == -1) e = 0;
        print(e);
    }

}