#![allow(unused_macros)]
#![allow(dead_code)]
#![allow(unused_imports)]

// # ファイル構成
// - use宣言
// - libモジュール
// - main関数
// - basicモジュール
//
// 常に使うテンプレートライブラリはbasicモジュール内にあります。
// 問題に応じて使うライブラリlibモジュール内にコピペしています。
// ライブラリのコードはこちら → https://github.com/RheoTommy/at_coder
// Twitterはこちら → https://twitter.com/RheoTommy

use std::collections::*;
use std::io::{stdout, BufWriter, Write};

use crate::basic::*;
use crate::lib::*;

pub mod lib {}

fn main() {
    let out = stdout();
    let mut writer = BufWriter::new(out.lock());
    let mut sc = Scanner::new();
    let n = sc.next_usize();
    let m = sc.next_usize();
    let a = (0..n).map(|_| sc.next_usize() - 1).collect::<Vec<_>>();
    let mut vertexes = vec![vec![]; m];
    let mut get_in = vec![0; m];

    for v in a.windows(3) {
        if !(v[0] != v[1] && v[0] != v[2] && v[1] != v[2]) {
            writeln!(writer, "{}", "No").unwrap();
            return;
        }
    }

    let mut f = true;
    for v in a.windows(2) {
        let l = v[0];
        let r = v[1];

        if f {
            vertexes[l].push(r);
            get_in[r] += 1;
        } else {
            vertexes[r].push(l);
            get_in[l] += 1;
        }
        f = !f;
    }

    let mut sorted = vec![];
    let mut queue = VecDeque::new();
    for i in 0..m {
        if get_in[i] == 0 {
            queue.push_back(i);
        }
    }

    while let Some(i) = queue.pop_front() {
        for &j in &vertexes[i] {
            get_in[j] -= 1;
            if get_in[j] == 0 {
                queue.push_back(j);
            }
        }
        sorted.push(i);
    }

    let mut ans = vec![0; m];
    let mut now = 0;
    for &si in &sorted {
        ans[si] = now;
        now += 1;
    }

    if sorted.len() != m {
        writeln!(writer, "{}", "No").unwrap();
    } else {
        writeln!(writer, "{}", "Yes").unwrap();
        let mut s = String::new();
        for si in ans {
            s.push_str(&(si + 1).to_string());
            s.push(' ');
        }
        writeln!(writer, "{}", s.trim()).unwrap();
    }
}

pub mod basic {
    pub const U_INF: u128 = 1 << 60;
    pub const I_INF: i128 = 1 << 60;

    pub struct Scanner {
        buf: std::collections::VecDeque<String>,
        reader: std::io::BufReader<std::io::Stdin>,
    }

    impl Scanner {
        pub fn new() -> Self {
            Self {
                buf: std::collections::VecDeque::new(),
                reader: std::io::BufReader::new(std::io::stdin()),
            }
        }

        fn scan_line(&mut self) {
            use std::io::BufRead;
            let mut flag = 0;
            while self.buf.is_empty() {
                let mut s = String::new();
                self.reader.read_line(&mut s).unwrap();
                let mut iter = s.split_whitespace().peekable();
                if iter.peek().is_none() {
                    if flag >= 5 {
                        panic!("There is no input!");
                    }
                    flag += 1;
                    continue;
                }

                for si in iter {
                    self.buf.push_back(si.to_string());
                }
            }
        }

        pub fn next<T: std::str::FromStr>(&mut self) -> T {
            self.scan_line();
            self.buf
                .pop_front()
                .unwrap()
                .parse()
                .unwrap_or_else(|_| panic!("Couldn't parse!"))
        }

        pub fn next_usize(&mut self) -> usize {
            self.next()
        }

        pub fn next_int(&mut self) -> i128 {
            self.next()
        }

        pub fn next_uint(&mut self) -> u128 {
            self.next()
        }

        pub fn next_chars(&mut self) -> Vec<char> {
            self.next::<String>().chars().collect()
        }

        pub fn next_string(&mut self) -> String {
            self.next()
        }

        pub fn next_char(&mut self) -> char {
            self.next()
        }

        pub fn next_float(&mut self) -> f64 {
            self.next()
        }
    }
}