function Main(input) {
  const data = input.trim();
 
  var strs = data.split("");
 
  var list = [];
 
  strs.forEach((n) => {
    if (list.indexOf(n) == -1) {
      list.push(n);
    } else {
      var idx = list.indexOf(n);
      list.splice(idx, 1);
    }
  });
 
  if (list.length > 0) {
    console.log("No");
  } else {
    console.log("Yes");
  }
}
 
Main(require("fs").readFileSync("/dev/stdin", "utf8"));