'use strict';
{
  const lines = require("fs").readFileSync("/dev/stdin", "utf8").split("");

  let answer = "Yes";

  if (lines.length % 2 === 0) {
    outer: {
      for (let i = 0; i < lines.length; i++) {
        for (let j = 0; j < lines.length; j++) {
          let count = 0;
          lines.forEach(num => {
            if (lines[i] === num) {
              count++;
            }
          });
          if (count % 2 != 0) {
            answer = "No";
            break outer;
          }
        }
      }
    }
  } else {
    answer = "No";
  }
  console.log(answer);

}
