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

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