import sys
from collections import defaultdict, Counter, deque
from itertools import permutations, combinations, product, combinations_with_replacement, groupby, accumulate
import operator
#from math import sqrt,isqrt
#from bisect import bisect_left,bisect_right
#from functools import lru_cache,reduce
#import heapq
#import numpy as np
#import networkx as nx
# from numba import njit, b1, i1, i4, i8, f8
# numba例 @njit(i1(i4[:], i8[:, :]),cache=True) 引数i4配列、i8 2次元配列,戻り値i1
def input(): return sys.stdin.readline().rstrip()
def divceil(n, k): return 1+(n-1)//k  # n/kの切り上げを返す


class scc_graph:

    def __init__(self, N):
        self.N = N
        self.edges = []

    def csr(self):
        self.start = [0]*(self.N+1)
        self.elist = [0]*len(self.edges)
        for e in self.edges:
            self.start[e[0]+1] += 1
        for i in range(1, self.N+1):
            self.start[i] += self.start[i-1]
        counter = self.start[:]
        for e in self.edges:
            self.elist[counter[e[0]]] = e[1]
            counter[e[0]] += 1

    def add_edge(self, v, w):
        self.edges.append((v, w))

    def scc_ids(self):
        self.csr()
        N = self.N
        now_ord = group_num = 0
        visited = []
        low = [0]*N
        order = [-1]*N
        ids = [0]*N
        parent = [-1]*N
        stack = []
        for i in range(N):
            if order[i] == -1:
                stack.append(i)
                stack.append(i)
                while stack:
                    v = stack.pop()
                    if order[v] == -1:
                        low[v] = order[v] = now_ord
                        now_ord += 1
                        visited.append(v)
                        for i in range(self.start[v], self.start[v+1]):
                            to = self.elist[i]
                            if order[to] == -1:
                                stack.append(to)
                                stack.append(to)
                                parent[to] = v
                            else:
                                low[v] = min(low[v], order[to])
                    else:
                        if low[v] == order[v]:
                            while True:
                                u = visited.pop()
                                order[u] = N
                                ids[u] = group_num
                                if u == v:
                                    break
                            group_num += 1
                        if parent[v] != -1:
                            low[parent[v]] = min(low[parent[v]], low[v])
        for i, x in enumerate(ids):
            ids[i] = group_num-1-x

        return group_num, ids

    def scc(self):
        group_num, ids = self.scc_ids()
        groups = [[] for _ in range(group_num)]
        for i, x in enumerate(ids):
            groups[x].append(i)
        return groups


def main():
    mod = 10**9+7
    mod2 = 998244353
    n, m = map(int, input().split())
    A = list(map(int, input().split()))
    sc = scc_graph(m)
    for i in range(n-1):
        if i!=n-2:
            if A[i] == A[i+2]:
                print('No')
                return
        if A[i] == A[i+1]:
            print('No')
            return
        if i % 2 == 0:
            sc.add_edge(A[i]-1, A[i+1]-1)
        else:
            sc.add_edge(A[i+1]-1, A[i]-1)
    points = sc.scc()
    if len(points) != m:
        print('No')
        return
    ans = [0]*m
    for i in range(m):
        ans[points[i][0]] = i+1
    print('Yes')
    print(*ans)


if __name__ == '__main__':
    main()