include<stdio.h>

int main(){

int num,i,pri,counter[26]={0};
char ch;

while(scanf("%c",&ch)!=EOF){
  if('a'<=ch&&ch<='z'){
    num=ch-'a';
    counter[num]++;
  }else if('A'<=ch&&ch<='Z'){
    num=ch-'A';
    counter[num]++;
  }
}

for(i=0;i<=25;i++){
  printf("%c : %d\n",i+'a',counter[i]);
}

return(0);
}