import sys
input=sys.stdin.readline
def main1(n,m,aby):
  g=[[] for _ in range(n)]
  for a,b,y in aby:
    a,b=a-1,b-1
    g[a].append([b,y])
    g[b].append([a,y])
  x=[0]*n
  flg=True
  for i in range(30):
    mi=set(range(n))
    seen=[-1]*n
    while mi:
      v0=mi.pop()
      for d in (0,1):
        flg=True
        seen[v0]=d
        todo=[[v0,-1]]
        while todo:
          v,p=todo.pop()
          mi.discard(v)
          for nv,y in g[v]:
            if nv==p:continue
            if seen[nv]==-1:
              seen[nv]=seen[v]^((y>>i)&1)
              todo.append([nv,v])
            elif seen[nv]==seen[v]^((y>>i)&1):
              continue
            else:
              flg=False
              break
          if not flg:break
      if not flg:return [-1]
    bit=1<<i
    for v in range(n):
      if seen[v]>0:
        x[v]+=bit
  return x

def chk(n,aby,x):
  for a,b,y in aby:
    a,b=a-1,b-1
    if x[a]^x[b]==y:
      pass
    else:
      return False
  return True

if __name__=='__main__':
  n,m=map(int,input().split())
  aby=[]
  for _ in range(m):
    a,b=map(int,input().split())
    y=int(input())
    aby.append([a,b,y])
  ret1=main1(n,m,aby)
  print(*ret1,sep='\n')