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

  mi=set(range(n))
  seen=[-1]*n
  while mi:
    v0=mi.pop()
    grp=set()
    flg=True
    seen[v0]=0
    todo=[v0]
    grp={v0}
    while todo:
      v=todo.pop()
      mi.discard(v)
      grp.add(v)
      for nv,y in g[v]:
        if seen[nv]==-1:
          seen[nv]=seen[v]^y
          todo.append(nv)
        elif seen[nv]==seen[v]^y:
          continue
        else:
          flg=False
          break
      if not flg:break
    if not flg:return [-1]
    for v in grp:
      if seen[v]>0:
        x[v]+=seen[v]
  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')