/////////////////////////////////No.349 干支の置き物
    //入力文字読み取り
    var inputall = require('fs').readFileSync('/dev/stdin', 'utf8');

    //すべて受け取り改行で区切って格納
    var input = inputall.split("\n");

    //干支の置物の総数
    var zodiac_all = input[0];


    //12個の空の入れ物を用意
    var zodiac = [];
    for (var i = 0; i < 12; i++) {
        zodiac[i] = 0;
    }

    //干支の名前を一つずつ読み取る
    for (var i = 1; i <= zodiac_all; i++) {
        if (input[i] == "ne") {
            zodiac[0]++
        }else if(input[i] == "ushi"){
            zodiac[1]++
        } else if (input[i] == "tora") {
            zodiac[2]++
        } else if (input[i] =="u") {
            zodiac[3]++
        } else if (input[i] == "tatsu") {
            zodiac[4]++
        } else if (input[i] == "mi") {
            zodiac[5]++
        } else if (input[i] == "uma") {
            zodiac[6]++
        } else if (input[i] == "hitsuji") {
            zodiac[7]++
        } else if (input[i] == "saru") {
            zodiac[8]++
        } else if (input[i] == "tori") {
            zodiac[9]++
        } else if (input[i] == "inu") {
            zodiac[10]++
        } else if (input[i] == "i") {
            zodiac[11]++
        }
    }
  
       //データをソート
    zodiac.sort(function (a, b) {
        if (a < b) return 1;
        if (a > b) return -1;
        return 0;
    });

    if (zodiac_all < zodiac[0] * 2 - 1) {
        console.log("NO")
    } else {
        console.log("YES")
    }