n, m = map(int, input().split())

edges = [[] for _ in range(n)]
for _ in range(m):
    a, b = map(int, input().split())
    a -= 1
    b -= 1
    y = int(input())
    edges[a].append((b, y))
    edges[b].append((a, y))
    
X = [0] * n
for k in range(30):
    bi = [-1] * n
    for i in range(n):
        if bi[i] != -1:
            continue
        bi[i] = 0
        stack = [i]
        while stack:
            pos = stack.pop()
            for npos, y in edges[pos]:
                if y >> k & 1:
                    x = 1
                else:
                    x = 0
                if bi[npos] == -1:
                    bi[npos] = bi[pos] ^ x
                    X[npos] += bi[npos] << k
                    stack.append(npos)
                elif bi[npos] != bi[pos] ^ x:
                    print(-1)
                    exit()
print(*X)