#include <bits/stdc++.h>
using namespace std;
int main(){
	char a[32768];
	int b[27]={0};
	int i,n,t;
	gets(a);
	t=strlen(a)-1;
	for(i=1;i<=t;i++){
		b[a[i-1]-'a']++;
	}
	
	for(i=1;i<=t;i++){
		if(b[i-1]!=0){
			cout<<char(i-1+97)<<":"<<b[i-1]<<" ";
			if(i%5==0)
				cout<<endl;}
	
	}
	return 0;
	}

/**************************************************************
	Problem: 1164
	User: fzy001
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2076 kb
****************************************************************/