#!/usr/local/gnu/bin/bash
read w
while((${#w}>0))
do
    c=`echo $w | cut -c 1`
    w_next=`echo $w | tr -d $c`
    (((${#w}-${#w_next})%2==0)) && w=$w_next || break
done
((${#w}==0)) && echo "Yes" || echo "No"
