n, m = map(int, input().split())
e = [set() for i in range(n)]
d = [0] * n
for i in range(m):
    u, v = map(int, input().split())
    u -= 1
    v -= 1
    e[u].add(v)
    e[v].add(u)
    d[u] += 1
    d[v] += 1


que = [i for i in range(n) if d[i] <= 3]
for u in que:
    for v in e[u]:
        e[v].discard(u)
        d[v] -= 1
        if d[v] == 3:
            que.append(v)

c = [0] * n
for u in reversed(que):
    cu = {1, 2, 3, 4}
    for v in e[u]:
        cu.discard(c[v])
    c[u] = cu.pop()

print("Yes")
print(*c)