N,M = map(int,input().split())
e = [[] for _ in range(N)]
from collections import defaultdict
d = defaultdict(lambda:-1)
for _ in range(M):
    a,b = map(int,input().split())
    a -= 1
    b -= 1
    y = int(input())
    if d[(a,b)] != -1:
        if d[(a,b)] != y:
            print(-1)
            exit()
    d[(a,b)] = y
    d[(b,a)] = y
    e[a].append(b)
    e[b].append(a)
    
X = [-1]*N
X[0] = 0
from collections import deque
v = deque()
v.append(0)
while v:
    x = v.popleft()
    
    for ix in e[x]:
        if X[ix] == -1:
            X[ix] = X[x]^d[(x,ix)]
            v.append(ix)
        if X[ix] != -1:
            if X[ix] != X[x]^d[(x,ix)]:
                print(-1)
                exit()
print(*X,sep='\n')