#include <bits/stdc++.h>
#include <random>
using namespace std; typedef unsigned long long _ulong; typedef long long int lint; typedef pair<lint, lint> plint; typedef pair<double long, double long> pld;
#define ALL(x) (x).begin(), (x).end()
#define SZ(x) ((lint)(x).size())
#define FOR(i, begin, end) for(lint i=(begin),i##_end_=(end);i<i##_end_;++i)
#define IFOR(i, begin, end) for(lint i=(end)-1,i##_begin_=(begin);i>=i##_begin_;--i)
#define REP(i, n) FOR(i,0,n)
#define IREP(i, n) IFOR(i,0,n)
#define endk '\n'
#define fi first
#define se second
struct fast_ios { fast_ios() { cin.tie(nullptr), ios::sync_with_stdio(false), cout << fixed << setprecision(20); }; } fast_ios_;
template<class T> auto add = [](T a, T b) -> T { return a + b; };
template<class T> auto f_max = [](T a, T b) -> T { return max(a, b); };
template<class T> auto f_min = [](T a, T b) -> T { return min(a, b); };
template<class T> using V = vector<T>;
using Vl = V<lint>; using VVl = V<Vl>;
template< typename T > ostream& operator<<(ostream& os, const vector< T >& v) {
	for (int i = 0; i < (int)v.size(); i++) os << v[i] << (i + 1 != v.size() ? " " : "");
	return os;
}
template< typename T >istream& operator>>(istream& is, vector< T >& v) {
	for (T& in : v) is >> in;
	return is;
}
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return 1; } return 0; }
lint gcd(lint a, lint b) { if (b == 0) return a; else return gcd(b, a % b); }
lint ceil(lint a, lint b) { return (a + b - 1) / b; }
lint digit(lint a) { return (lint)log10(a); }
lint e_dist(plint a, plint b) { return abs(a.fi - b.fi) * abs(a.fi - b.fi) + abs(a.se - b.se) * abs(a.se - b.se); }
lint m_dist(plint a, plint b) { return abs(a.fi - b.fi) + abs(a.se - b.se); }
void Worshall_Floyd(VVl& g) { REP(k, SZ(g)) REP(i, SZ(g)) REP(j, SZ(g)) chmin(g[i][j], g[i][k] + g[k][j]); }
const lint MOD1000000007 = 1000000007, MOD998244353 = 998244353, INF = 1e15;
lint dx[8] = { 1, 0, -1, 0, 1, -1, 1, -1 }, dy[8] = { 0, 1, 0, -1, -1, -1, 1, 1 };
bool YN(bool flag) { cout << (flag ? "YES" : "NO") << endk; return flag; } bool yn(bool flag) { cout << (flag ? "Yes" : "No") << endk; return flag; }
struct Edge {
	lint from, to;
	lint cost;
	Edge(lint u, lint v, lint c) {
		cost = c;
		from = u;
		to = v;
	}
	bool operator<(const Edge& e) const {
		return cost < e.cost;
	}
};
struct WeightedEdge {
	lint to;
	lint cost;
	WeightedEdge(lint v, lint c = 1) {
		to = v;
		cost = c;
	}
	bool operator<(const WeightedEdge& e) const {
		return cost < e.cost;
	}
};
using WeightedGraph = V<V<WeightedEdge>>;
typedef pair<plint, lint> tlint;
typedef pair<plint, plint> qlint;
typedef pair<string, lint> valstring;

struct Topological_Sort {
public:

	Topological_Sort(int _n) : G(_n, Vl()), indegree(_n, 0), N(_n) {}

	void add_edge(int u, int v) {
		G[u].push_back(v);
		indegree[v]++;
	}

	Vl get() {
		Vl sorted_vertices;
		Vl tmp_indegree = indegree;
		queue<int> que;
		REP(i, N) {
			if (tmp_indegree[i] == 0) que.push(i);
		}

		while (!que.empty()) {
			int v = que.front(); que.pop();
			REP(i, SZ(G[v])) {
				int u = G[v][i];
				tmp_indegree[u]--;
				if (tmp_indegree[u] == 0) que.push(u);
			}
			sorted_vertices.push_back(v);
		}

		return sorted_vertices;
	}
private:
	VVl G;
	Vl indegree;
	int N;
};

lint N, M, A;
int main() {
	cin >> N >> M;
	Vl arr(N);
	
	cin >> arr;
	REP(i, N - 2) {
		if (arr[i] == arr[i + 1] || arr[i] == arr[i + 2] || arr[i + 1] == arr[i + 2]) {
			cout << "No" << endk;
			return 0;
		}
	}
	Topological_Sort topo1(M), topo2(M);
	set<plint> st;
	REP(i, N) arr[i]--;
	REP(i, N - 1) {
		if (i % 2 == 0 && st.count({ arr[i], arr[i + 1] })) {
			continue;
		}
		if (i % 2 == 1 && st.count({ arr[i + 1], arr[i] })) {
			continue;
		}
		if (i % 2 == 0) {
			topo1.add_edge(arr[i], arr[i + 1]);
			topo2.add_edge(arr[i + 1], arr[i]);
		}
		else {
			topo2.add_edge(arr[i], arr[i + 1]);
			topo1.add_edge(arr[i + 1], arr[i]);
		}
		if(i%2 == 0) st.insert({ arr[i], arr[i + 1] });
		else st.insert({ arr[i + 1], arr[i] });
	}
	{
		auto vec = topo1.get();
		if (SZ(vec) == M) {
			Vl ans(M);
			REP(i, M) {
				ans[vec[i]] = i + 1;
			}
			cout << "Yes" << endk;
			cout << ans << endk;
			return 0;
		}
	}
	{
		auto vec = topo2.get();
		if (SZ(vec) == M) {
			Vl ans(M);
			REP(i, M) {
				ans[vec[i]] = i + 1;
			}
			cout << "Yes" << endk;
			cout << ans << endk;
			return 0;
		}
	}
	cout << "No" << endk;
}