Problem:
Score : 200 points

Problem Statement

Let w be a string consisting of lowercase letters.
We will call w beautiful if the following condition is satisfied:

Each lowercase letter of the English alphabet occurs even number of times in w.

You are given the string w. Determine if w is beautiful.

Constraints

1 \leq |w| \leq 100

w consists of lowercase letters (a-z).

Input

The input is given from Standard Input in the following format:

w

Output

Print Yes if w is beautiful. Print No otherwise.

Sample Input 1

abaccaba

Sample Output 1

Yes

a occurs four times, b occurs twice, c occurs twice and the other letters occur zero times.

Sample Input 2

hthth

Sample Output 2

No

Solution in Rust (1.42.0) (judge verdict: Accepted)

use proconio::input;

fn main() {
    input! {
        w: String
    };

    let mut chars: Vec<char> = w.chars().collect();
    let mut is_btfl = true;
    chars.sort();

    for pair in chars.chunks(2) {
        if chars.len() % 2 != 0 {
            is_btfl = false;
            break
        }
        if pair[0] != pair[1] {
            is_btfl = false;
            break
        }
    }
    println!("{}", if is_btfl {"Yes"} else {"No"})
}