import sys
from collections import deque
sys.setrecursionlimit(10**7)
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int,sys.stdin.readline().rstrip().split())
def LI(): return list(map(int,sys.stdin.readline().rstrip().split()))
def LI2(): return list(map(int,sys.stdin.readline().rstrip()))
def S(): return sys.stdin.readline().rstrip()
def LS(): return list(sys.stdin.readline().rstrip().split())
def LS2(): return list(sys.stdin.readline().rstrip())


N,M = MI()
A = LI()

for i in range(N-2):
    if A[i] == A[i+2] or A[i] == A[i+1] or A[i+1] == A[i+2]:
        exit(print('No'))

Graph = [[] for _ in range(M+1)]
in_deg = [0]*(M+1)  # 入次数
for i in range(N-1):
    if i % 2 == 0:
        Graph[A[i]].append(A[i+1])
        in_deg[A[i+1]] += 1
    else:
        Graph[A[i+1]].append(A[i])
        in_deg[A[i]] += 1

deq = deque([i for i in range(1,M+1) if in_deg[i] == 0])
T = []  # トポロジカルソート
while deq:
    u = deq.pop()
    T.append(u)
    for v in Graph[u]:
        in_deg[v] -= 1
        if in_deg[v] == 0:
            deq.append(v)

if len(T) == M:
    print('Yes')
    ANS = [0]*(M+1)
    for i in range(1,M+1):
        ANS[T[i-1]] = i
    print(*ANS[1:])
else:
    print('No')