import sys
input = sys.stdin.readline

class UnionFind(object):
    def __init__(self, n=1):
        self.par = [i for i in range(n)]
        self.rank = [0 for _ in range(n)]
        self.size = [1 for _ in range(n)]
        self.diff_weight = [0 for _ in range(n)]
        self.flag = 1

    def find(self, x):
        if self.par[x] == x:
            return x
        else:
            root = self.find(self.par[x])
            self.diff_weight[x] ^= self.diff_weight[self.par[x]]
            self.par[x] = root
            return self.par[x]

    def union(self, x, y, w):
        rx = self.find(x)
        ry = self.find(y)
        w ^= self.diff_weight[y]^self.diff_weight[x]
        if rx != ry:
            if self.rank[rx] < self.rank[ry]:
                rx, ry = ry, rx
            if self.rank[rx] == self.rank[ry]:
                self.rank[rx] += 1
            self.par[ry] = rx
            self.size[rx] += self.size[ry]
            self.diff_weight[ry] = w
        else:
            if w:
                self.flag = 0


    def is_same(self, x, y):
        return self.find(x) == self.find(y)

    def get_size(self, x):
        x = self.find(x)
        return self.size[x]
    
    def diff(self, x, y):
        return self.diff_weight[y]^self.diff_weight[x]

N, M = map(int, input().split())
U = UnionFind(N)
for i in range(M):
    A, B = map(int, input().split())
    A, B = A - 1, B - 1
    Y = int(input())    
    U.union(A, B, Y)
    
if U.flag:
    for i in range(N):
        U.find(i)
        print(U.diff_weight[i])
else:
    print(-1)