import sys
input = sys.stdin.readline
from collections import *

N, M = map(int, input().split())
G = [[] for _ in range(N)]
d = defaultdict(set)

for _ in range(M):
    A, B = map(int, input().split())
    Y = int(input())
    G[A-1].append((B-1, Y))
    G[B-1].append((A-1, Y))
    d[10**6*min(A, B)+max(A, B)].add(Y)

for k in d:
    if len(d[k])>=2:
        print(-1)
        exit()
        
ans = [-1]*N

for v in range(N):
    if ans[v]==-1:
        ans[v] = 0
        q = deque([v])
        
        while q:
            v = q.popleft()
            
            for nv, Y in G[v]:
                if ans[nv]==-1:
                    ans[nv] = ans[v]^Y
                    q.append(nv)
                else:
                    if ans[v]^ans[nv]!=Y:
                        print(-1)
                        exit()

for i in range(N):
    print(ans[i])