#include<cstdio>
#include<string>

using namespace std ;

int main(){
    int ASCA[26]={'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'};
    int count[26] = {0};
    char arr[100];
    scanf("%s",arr);
    string buf = arr;
    int len1 = buf.size();
    for(int i = 0 ; i < len1 ;++i){
        for(int j = 0 ; j < 26 ;++j){
         if(buf[i] == ASCA[j]){
            ++count[j];
        }else{
            continue;
        }
        }
    }
    for(int i = 0 ; i < 26 ;++i){
        printf("%c:%d\n",ASCA[i],count[i]);
    }
}