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'use strict';

const fs = require('fs');

process.stdin.resume();

process.stdin.setEncoding('utf-8');

let inputString = '';

let currentLine = 0;

process.stdin.on('data', inputStdin => {

inputString += inputStdin;

});

process.stdin.on('end', _ => {

inputString = inputString.replace(/\s*$/, '')

.split('\n')

.map(str => str.replace(/\s*$/, ''));

main();

});

function readLine() {

return inputString[currentLine++];

}

// Complete the gameOfThrones function below.

function gameOfThrones(s1) {

var obj = {};

for (var i = 0; i < s1.length; i++) {

if (typeof obj[s1[i]] === 'undefined') {

obj[s1[i]] = 1;

} else {

obj[s1[i]] = obj[s1[i]] + 1;

}

}

let c = 0;

for (var i in obj) {

if (obj[i] % 2 === 0) {

} else {

c++;

}

}

return c<= 1 ? "YES" : "NO";

}

function main() {

const ws = fs.createWriteStream(process.env.OUTPUT_PATH);

const s = readLine();

let result = gameOfThrones(s);

ws.write(result + "\n");

ws.end();

}