#include <iostream>
#include <algorithm>
int main(){
std::string str;
std::getline(std::cin, str);
for
(char target:
{'a','b','c','d','e','f','g','h','i','j','k','l',
'm','n','o','p','q','r','s','t','u','v','w','x','y','z'})
{
size_t num_target = std::count(str.begin(), str.end(), target);
if
(num_target>=1)
std::cout << target <<" : " << num_target << '
';
}
return 0;
}