import sys
input=sys.stdin.readline
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])
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):
  bit=1<<i
  for d in (0,bit):
    seen=[-1]*n
    flg=True
    seen[0]=d
    todo=[0]
    while todo:
      v=todo.pop()
      for nv,y in g[v]:
        if seen[nv]==-1:
          seen[nv]=seen[v]^(y&bit)
          todo.append(nv)
        elif seen[nv]==seen[v]^(y&bit):
          continue
        else:
          flg=False
          break
    if flg:
      for v in range(n):
       if seen[v]:
         x[v]+=bit
      break
  if not flg:
    print(-1)
    exit()
print(*x,sep='\n')