#include <iostream>
#include <string>
#include <string.h>
#include <ctype.h>
using std::endl;
using std::cin;
using std::cout;
using std::string;
int result[26];
int main()
{
#ifdef LOCAL
	freopen("input.txt" , "r" , stdin);
#endif
	string str;
	while(getline(cin , str))
	{
		memset(result , 0 , sizeof result);
		for(int i=0; i<str.length();++i)
		{
			if(isalpha(str[i]))
			{
				result[str[i]-'a']++;
			}
		}
		for(int i=0;i<26;++i)
		{
			cout << (char)('a'+i) << ":" <<result[i] << endl;
		}
		cout << endl;
	}
	return 0;
}