def main():
    n, m = list(map(int, input().split()))
    node = [[] for _ in range(n)]
    A = [0] * n
    for _ in range(m):
        u, v = list(map(lambda x: int(x)-1, input().split()))
        node[u].append(v)
        node[v].append(u)
        A[u] += 1; A[v] += 1
    I = [i for i in range(n)]
    I.sort(key = lambda x: -A[x])
    C = [0 for _ in range(n)]
    B = [-1] * n
    for i in I:
        for j in range(4):
            if not C[i] >> j & 1:
                B[i] = j+1
                for k in node[i]:
                    C[k] |= 1 << j
                break
        else:
            assert 0
    print("Yes")
    print(*B)

main()