#include <limits>
#include <initializer_list>
#include <utility>
#include <bitset>
#include <tuple>
#include <type_traits>
#include <functional>
#include <string>
#include <array>
#include <deque>
#include <list>
#include <queue>
#include <stack>
#include <vector>
#include <map>
#include <set>
#include <unordered_map>
#include <unordered_set>
#include <iterator>
#include <algorithm>
#include <complex>
#include <random>
#include <numeric>
#include <iostream>
#include <iomanip>
#include <sstream>
#include <regex>
#include <cassert>
#include <cstddef>
#include <variant>

#define endl codeforces

#define ALL(v) std::begin(v), std::end(v)
#define ALLR(v) std::rbegin(v), std::rend(v)

using ll = std::int64_t;
using ull = std::uint64_t;
using pii = std::pair<int, int>;
using tii = std::tuple<int, int, int>;
using pll = std::pair<ll, ll>;
using tll = std::tuple<ll, ll, ll>;
using size_type = ssize_t;
template <typename T> using vec = std::vector<T>;
template <typename T> using vvec = vec<vec<T>>;

template <typename T> const T& var_min(const T &t) { return t; }
template <typename T> const T& var_max(const T &t) { return t; }
template <typename T, typename... Tail> const T& var_min(const T &t, const Tail&... tail) { return std::min(t, var_min(tail...)); }
template <typename T, typename... Tail> const T& var_max(const T &t, const Tail&... tail) { return std::max(t, var_max(tail...)); }
template <typename T, typename... Tail> void chmin(T &t, const Tail&... tail) { t = var_min(t, tail...); }
template <typename T, typename... Tail> void chmax(T &t, const Tail&... tail) { t = var_max(t, tail...); }

template <typename T, std::size_t Head, std::size_t... Tail> 
struct multi_dim_array { using type = std::array<typename multi_dim_array<T, Tail...>::type, Head>; };

template <typename T, std::size_t Head> 
struct multi_dim_array<T, Head> { using type = std::array<T, Head>; };

template <typename T, std::size_t... Args> using mdarray = typename multi_dim_array<T, Args...>::type;

template <typename T, typename F, typename... Args> 
void fill_seq(T &t, F f, Args... args) { 
    if constexpr (std::is_invocable<F, Args...>::value) { 
        t = f(args...); 
    } else { 
        for (size_type i = 0; i < t.size(); i++) fill_seq(t[i], f, args..., i); 
    } 
}

template <typename T> vec<T> make_v(size_type sz) { return vec<T>(sz); }

template <typename T, typename... Tail> 
auto make_v(size_type hs, Tail&&... ts) { 
    auto v = std::move(make_v<T>(std::forward<Tail>(ts)...)); 
    return vec<decltype(v)>(hs, v); 
}

namespace init__ { 
struct InitIO { 
    InitIO() { 
        std::cin.tie(nullptr); 
        std::ios_base::sync_with_stdio(false); 
        std::cout << std::fixed << std::setprecision(30); 
    } 
} init_io; 
}

template <typename T>
T ceil_pow2(T bound) {
    T ret = 1;
    while (ret < bound) ret *= 2;
    return ret;
}

template <typename T>
T ceil_div(T a, T b) { return a / b + !!(a % b); }



namespace graph {

using Node = ll;
using Weight = ll;
using Edge = std::pair<Node, Weight>;

template <bool Directed>
struct Graph : public vvec<Edge> {
    using vvec<Edge>::vvec;

    void add_edge(Node f, Node t, Weight w = 1) {
        (*this)[f].emplace_back(t, w);
        if (!Directed) (*this)[t].emplace_back(f, w);
    }

    Graph<Directed> build_inv() const {
        Graph<Directed> ret(this->size());
        for (Node i = 0; i < this->size(); i++) {
            for (const Edge &e : (*this)[i]) {
                Node j;
                Weight w;
                std::tie(j, w) = e;
                if (!Directed && j < i) continue;
                ret.add_edge(j, i, w);
            }
        }

        return ret;
    }
};

template <typename Iterator>
class dst_iterator {
    Iterator ite;

public:
    dst_iterator(Iterator ite) : ite(ite) { }

    bool operator ==(const dst_iterator<Iterator> &oth) const {
        return ite == oth.ite;
    }

    bool operator !=(const dst_iterator<Iterator> &oth) const {
        return !(*this == oth);
    }

    bool operator <(const dst_iterator<Iterator> &oth) const {
        return ite < oth.ite;
    }

    bool operator >(const dst_iterator<Iterator> &oth) const {
        return ite > oth.ite;
    }

    bool operator <=(const dst_iterator<Iterator> &oth) const {
        return ite <= oth.ite;
    }

    bool operator >=(const dst_iterator<Iterator> &oth) const {
        return ite >= oth.ite;
    }

    const Node& operator *() {
        return ite->first;
    }

    const Node& operator *() const {
        return ite->first;
    }

    dst_iterator operator ++() {
        ++ite;
        return ite;
    }
};

class dst_iteration {
    using ite_type = vec<Edge>::const_iterator;
    const vec<Edge> &edges;

public:
    dst_iteration(const vec<Edge> &edges) : edges(edges) { }

    auto begin() const {
        return dst_iterator<ite_type>(edges.cbegin());
    }

    auto end() const {
        return dst_iterator<ite_type>(edges.cend());
    }
};

class dst_reverse_iteration {
    using ite_type = vec<Edge>::const_reverse_iterator;
    const vec<Edge> &edges;

public:
    dst_reverse_iteration(const vec<Edge> &edges) : edges(edges) { }

    auto begin() const {
        return dst_iterator<ite_type>(edges.crbegin());
    }

    auto end() const {
        return dst_iterator<ite_type>(edges.crend());
    }
};

dst_iteration dst(const vec<Edge> &edges) {
    return dst_iteration(edges);
}

dst_reverse_iteration rdst(const vec<Edge> &edges) {
    return dst_reverse_iteration(edges);
}

}

namespace graph {

template <typename Graph>
struct topological_sort {
    const Graph &g;
    size_type n;
    vec<Node> ret;
    vec<bool> pass, used;

    topological_sort(const Graph &g) 
        : g(g), n(g.size()), pass(n), used(n)
    {
    }

    bool dfs(ll cur) {
        used[cur] = true;
        pass[cur] = true;
        for (auto &&nxt : dst(g[cur])) {
            if (pass[nxt]) return false;
            if (used[nxt]) continue;
            if (!dfs(nxt)) return false;
        }
        ret.push_back(cur);
        pass[cur] = false;
        return true;
    }

    vec<Node> solve() {
        for (Node i = 0; i < n; i++) {
            if (used[i]) continue;
            if (!dfs(i)) {
                ret.clear();
                break;
            }
        }
        std::reverse(ALL(ret));
        return ret;
    }
};

template <typename Graph>
vec<Node> topsort(const Graph &g) {
    return topological_sort<Graph>(g).solve();
}

}

vec<ll> solve() {
    ll n, m;
    std::cin >> n >> m;

    vec<ll> av(n);
    for (ll &e : av) {
        std::cin >> e;
        e--;
    }
        
    for (ll i = 0; i < n - 2; i++) {
        if (av[i] == av[i + 2]) return vec<ll>(0);
    }

    for (ll dir = 0; dir <= 1; dir++) {
        graph::Graph<true> g(m);
        for (ll i = 0; i < n - 2; i++) {
            const ll a0 = av[i], a1 = av[i + 1], a2 = av[i + 2];
            if ((dir + i) & 1) {
                g.add_edge(a0, a1);
                g.add_edge(a2, a1);
            } else {
                g.add_edge(a1, a0);
                g.add_edge(a1, a2);
            }
        }

        auto nodes = graph::topsort(g);


        if (nodes.empty()) continue;

        vvec<ll> pairs(m);
        for (ll i = 0; i < n - 2; i++) {
            const ll a = av[i], b = av[i + 2];
            pairs[a].push_back(b);
            pairs[b].push_back(a);
        }

        vec<ll> lb(m, 0);
        vec<ll> ans(m, 0);

        for (ll e : nodes) {
            ans[e] = lb[e] + 1;
            for (ll nxt : graph::dst(g[e])) chmax(lb[nxt], ans[e]);
            for (ll nxt : pairs[e]) chmax(lb[nxt], ans[e]);
        }

        for (ll &e : ans) if (e == 0) e = 1;

        return ans;
    }

    return vec<ll>(0);
}

int main() {
    auto ans = solve();
    if (ans.empty()) {
        std::cout << "No\n";
    } else {
        std::cout << "Yes\n";
        ll n = ans.size();
        for (ll i = 0; i < n; i++) std::cout << ans[i] << " \n"[i + 1 == n];
    }
    return 0;
}