class WeightedUnionFind:
  def __init__(self, n):
    self.node = [-1 for _ in range(n)]
    self.value = [0 for _ in range(n)]

  def root(self, x):
    if self.node[x] < 0:
      return x
    else:
      r = self.root(self.node[x])
      self.value[x] ^= self.value[self.node[x]]
      self.node[x] = r
      return r

  def size(self, x):
    x = self.root(x)
    return (- self.node[x])

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

  def weight(self, x):
    self.root(x)
    return self.value[x]

  def diff(self, x, y):
    return self.weight(y) ^ self.weight(x)

  def unite(self, x, y, w):
    w ^= self.weight(x)
    w ^= self.weight(y)
    rx = self.root(x)
    ry = self.root(y)
    if rx == ry:
      return

    dx = self.node[x]
    dy = self.node[y]
    if dx <= dy:
      self.node[ry] = rx
      self.node[rx] += dy
      self.value[ry] = w
    else:
      self.node[rx] = ry
      self.node[ry] += dx
      self.value[rx] = w

n, m = map(int, input().split())
wuf = WeightedUnionFind(n)
for _ in range(m):
  a, b = map(int, input().split())
  a -= 1
  b -= 1
  y = int(input())
  if not wuf.is_same(a, b):
    wuf.unite(a, b, y)
  elif wuf.diff(a, b) != y:
    print("-1")
    exit()

for v in range(n):
  print(wuf.weight(v))