import std.stdio;
import std.string;

void main()
{
  bool flg = false;
  bool[char] num;
  foreach(char a;readln.chomp())
    if(a in num) num[a] = !num[a];
    else num[a] = true;
    foreach(bool a;num)
    flg |= a;
  writeln(flg? "No" : "Yes");
}
