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 (1.15.1) (judge verdict: Wrong Answer)

use std::io::Read;
use std::collections::HashMap;

fn main() {
    let mut buf = String::new();
    std::io::stdin().read_to_string(&mut buf).unwrap();
    
    let mut m: HashMap<char, u32> = HashMap::new();
    for c in buf.chars() {
        let mut count = 1;
        if let Some(x) = m.get(&c) {
            count += *x;
        }
        m.insert(c, count);
    }
    
    if m.values().all(|c| c % 2 == 0) {
        println!("Yes");
    } else {
        println!("No");
    }
}