#1370
import sys;input = lambda: sys.stdin.readline().rstrip()
#import numpy as np
#import heapq
from collections import deque
def topological_sort(In, Out):
    """
    In: 入力してくる頂点集合
    Out: 出力先の頂点集合
    """
    dq = deque()
    L = []
    for i, I in enumerate(In):
        if not I:
            dq.append(i)
    while dq:
        v = dq.popleft()
        L.append(v)
        for w in Out[v]:
            In[w].remove(v)
            if not In[w]:
                dq.append(w)
    if len(L) < len(In):
        return False
    return L

# = input()
# = int(input())
n, m = map(int,input().split())
A = list(map(lambda x: int(x)-1,input().split()))

for i in range(N-2):
    if len(set(A[i:i+3])) != 3:
        print('No')
        exit()

In, Out = [set() for _ in range(m)], [set() for _ in range(m)]
for i in range(n-1):
    if i&1:
        In[A[i]].add(A[i+1])
        Out[A[i+1]].add(A[i])
    else:
        In[A[i+1]].add(A[i])
        Out[A[i]].add(A[i+1])

ts = topological_sort(In, Out)

if not ts:
    print('No')
else:
    print('Yes')
    X = [None]*m
    for i in range(m):
        X[ts[i]] = i+1
    print(*X, sep = ' ')