#include<iostream>
using namespace std;
int main(){
 string s;
 while(cin>>s){
  int a[26]={0};
  for(int i=0;i<s.length();i++){
   if(s[i]>='a'&&s[i]<='z')a[s[i]-'a']++;
   if(s[i]>='A'&&s[i]<='Z')a[s[i]-'A']++;
  }
  int ans=0;
  for(int i=0;i<26;i++){
   if(a[i]%2)ans++;
  }
  if(ans<=1)cout<<"Yes\n";
  else cout<<"No\n";
  for(int i=0;i<26;i++){
   if(a[i]>0)cout<<(char)(i+'A')<<":"<<a[i]<<'\n';
  }cout<<'\n';
 }
}