#include <iostream>
#include<bits/stdc++.h>
#define ll long long
using namespace std;

int main() {
 string s;
 cin>>s;
 sort(s.begin(),s.end());
 int len =s.size();
 for(int i=0 ;i<len ;i++)
 {
     char c= s[i];
     int cntr;
     while(s[i]==s[++i])
     {
         cntr++;
     }
     i--;
     cout<<c<<" : "<<cntr;
     cout<<endl;

 }
    return 0;
}