var obj = init();
Main();
function nextInt(){return myconv(next(),1);}
function nextStrArray(){return myconv(next(),2);}//半角スペース分割
function nextIntArray(){return myconv(next(),4);}//半角スペース + 数値化
function nextCharArray(){return myconv(next(),6);}//1文字分割
function next(){return obj.next();}
function hasNext(){return obj.hasNext();}
function myin(){return require("fs").readFileSync("/dev/stdin", "utf8").trim().split("\n");}
function init(){
  var inputFile = myin();
  var returnObj = {
    "list" : inputFile, "index" : 0, "max" : inputFile.length,
    "hasNext" : function(){return (this.index < this.max);},
    "next" : function(){if(!this.hasNext()){return "";}else{var returnInput = this.list[this.index];this.index++;return returnInput;}}
  };
  return returnObj;
}
function myout(t){console.log(t);}//標準出力
function myerr(t){console.error(t);}//標準エラー出力
//[no]要素の扱い。数値型
//不明値、異常時:引数そのまま返す　1:数値へ変換
//2:半角SPで分割 4:半角SPで分割し、数値配列へ
//6:1文字で分割  7:1文字で分割し、数値配列へ
//8:半角SPで結合 9:改行で結合 0:文字なしで結合
function myconv(i,no){try{switch(no){case 1:return parseInt(i);case 2:return i.split(" ");case 4:return i.split(" ").map((a)=>Number(a));case 6:return i.split("");case 7:return i.split("").map((a)=>Number(a));case 8:return i.join(" ");case 9:return i.join("\n");case 0:return i.join("");default:return i;}}catch(e){return i;}}
function Main(){
  var s = next();
  var N = s.length;
  if(N < 7){
     myout("No");
    return;
  }
  var mae = "";
  var maeN = Math.floor(N / 2);
  var ato = "";
  var atoN = Math.ceil(N / 2);
  
  for(var i = 0; i < maeN; i++){
    mae += s[i];
  }
  for(var i = atoN; i < N; i++){
    ato += s[i];
  }
  
  for(var i = 0; i < N; i++){
    myerr("i:" + i + ":" + s[i] + " j:" + (N - i - 1) + ":" + s[N - i - 1]);
    if(s[i] != s[N - i - 1]){
      myout("No");
      return;
    }
  }
  
  for(var i = 0; i < maeN; i++){
    myerr("i:" + i + ":" + mae[i] + " j:" + (maeN - i - 1) + ":" + mae[maeN - i - 1]);
    if(mae[i] != mae[maeN - i - 1]){
      myout("No");
      return;
    }
    myerr("i:" + i + ":" + ato[i] + " j:" + (maeN - i - 1) + ":" + ato[maeN - i - 1]);
    if(ato[i] != ato[maeN - i - 1]){
      myout("No");
      return;
    }
  }
  
  myout("Yes");
}