#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<(to);x++)
#define FORR(x,arr) for(auto& x:arr)
#define FORR2(x,y,arr) for(auto& [x,y]:arr)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
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(a>b){a=b;return 1;}return 0;}
//-------------------------------------------------------

int N,M;
int A[101010];

vector<int> E[101010];
int in[101010];
int ret[101010];
void solve() {
	int i,j,k,l,r,x,y; string s;
	
	cin>>N>>M;
	FOR(i,N) cin>>A[i], A[i]--;
	
	FOR(i,N-1) if(A[i]==A[i+1]) return _P("No\n");
	FOR(i,N-2) if(A[i]==A[i+2]) return _P("No\n");
	FOR(i,N-1) {
		if(i%2==0) {
			E[A[i]].push_back(A[i+1]);
			in[A[i+1]]++;
		}
		else {
			E[A[i+1]].push_back(A[i]);
			in[A[i]]++;
		}
	}
	
	queue<int> Q;
	FOR(i,M) if(in[i]==0) Q.push(i);
	int cur=0;
	while(Q.size()) {
		x=Q.front();
		Q.pop();
		ret[x]=++cur;
		FORR(e,E[x]) {
			in[e]--;
			if(in[e]==0) Q.push(e);
		}
	}
	if(cur!=M) return _P("No\n");
	cout<<"Yes"<<endl;
	FOR(i,M) cout<<ret[i]<<" ";
	cout<<endl;
	
}


int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false), cin.tie(0);
	FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	cout.tie(0); solve(); return 0;
}