from collections import defaultdict

n, m = map(int, input().split())
graph = [[] for _ in range(n)]
memo = defaultdict(lambda: defaultdict(lambda: -1))
for _ in range(m):
    a, b = map(int, input().split())
    y = int(input())
    a, b = a - 1, b - 1
    graph[a].append(b)
    graph[b].append(a)
    if a > b:
        b, a = a, b
    if memo[a][b] >= 0:
        if memo[a][b] == y:
            continue
        else:
            print(-1)
            exit()
    memo[a][b] = y


used = [0] * n
ans = [-1] * n
for i in range(n):
    if not used[i]:
        stack = [i]
        used[i] = 1
        ans[i] = 0
        while stack:
            v = stack.pop()
            now = ans[v]
            for u in graph[v]:
                if u < v:
                    temp = memo[u][v]
                else:
                    temp = memo[v][u]
                if used[u]:
                    if ans[u] ^ ans[v] == temp:
                        continue
                    else:
                        print(-1)
                        exit()
                used[u] = 1
                ans[u] = temp ^ ans[v]
                stack.append(u)
for a in ans:
    print(a)