function main(input){
  var w=input;
  var str = 'abcdefghijklmnopqrstuvwxyz';
  var N=str.length;
  for(var i=0;i<N;i++){
    var reg = new RegExp(''+str[i],'g');
    if(w.match(reg).length%2===1){
      break;
    }
  }
  console.log((i===N)?'Yes':'No');
}

main(require('fs').readFileSync('/dev/stdin', 'UTF-8'));
