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"));
