#include <bits/stdc++.h>
//#include <chrono>
//#pragma GCC optimize("Ofast")
using namespace std;
#define reps(i,s,n) for(int i = s; i < n; i++)
#define rep(i,n) reps(i,0,n)
#define Rreps(i,n,e) for(int i = n - 1; i >= e; --i)
#define Rrep(i,n) Rreps(i,n,0)
#define ALL(a) a.begin(), a.end()

using ll = long long;
using vec = vector<ll>;
using mat = vector<vec>;

ll N,M,H,W,Q,K,A,B;
string S;
using P = pair<ll, ll>;
const ll INF = (1LL<<60);

template<class T> bool chmin(T &a, const T &b){
    if(a > b) {a = b; return true;}
    else return false;
}
template<class T> bool chmax(T &a, const T &b){
    if(a < b) {a = b; return true;}
    else return false;
}
template<class T> void my_printv(std::vector<T> v,bool endline = true){
    if(!v.empty()){
        for(std::size_t i{}; i<v.size()-1; ++i) std::cout<<v[i]<<" ";
        std::cout<<v.back();
    }
    if(endline) std::cout<<std::endl;
}

void no(){
    cout<<"No"<<endl;
    exit(0);
}

void solve(mat &g, mat &rg){
    vec num(M, 0), val(M, -1);
    int res = 1;
    queue<int> que;
    rep(i, M){
        num[i] = rg[i].size();
        if(num[i] == 0){
            que.push(i);
        }
    }
    while(!que.empty()){
        int v = que.front(); que.pop();
        val[v] = res++;
        for(int to : g[v]){
            if(--num[to] == 0){
                que.push(to);
            }
        }
    }
    if(accumulate(ALL(num), 0LL) == 0){
        cout<<"Yes"<<endl;
        my_printv(val);
        exit(0);
    }
}

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cin>>N>>M;
    vec a(N);
    rep(i, N) {cin>>a[i]; --a[i];}
    rep(i, N - 1) if(a[i] == a[i+1]) no();
    rep(i, N - 2) if(a[i] == a[i+2]) no();
    mat G1(M), G2(M);
    rep(i, N - 1){
        auto &g = (i&1 ? G1 : G2), &h = (i&1 ? G2 : G1);
        g[a[i]].push_back(a[i + 1]);
        h[a[i + 1]].push_back(a[i]);
    }
    solve(G1, G2);
    solve(G2, G1);
    no();
}