#include<bits/stdc++.h>
using namespace std;

int ada[105];
string s;

int main(){
	cin >> s;
	int cnt = 0;
	for(int i=0;i<s.size();i++){
		ada[s[i]-'a']^=1;
		if(ada[s[i]-'a'] == 1) cnt++;
		else cnt--;
	}
	if(cnt > 0) cout << "No\n";
	else cout << "Yes\n";
	return 0;
}