#include<cstdio>
#include<iostream>
#include<cctype>
using namespace std;
int main()
{
	char ch;
	int count[26]={};
	while(scanf("%c",&ch)!=EOF)
	{
		ch=tolower(ch);
		if(isalpha(ch)!=0)
		{
			count[ch-'a']++;
		}
		
	}
	for(int i=0;i<26;i++)
		{
			printf("%c : %d\n",i+'a',count[i]);    	
		}
		return 0;
}