#include<stdio.h>
int main(){
int c[26]={0},i;
char ch;
while((ch=getchar())!='\n')
if(ch >= 'a' && ch<= 'z')
c[ch-'a']++;
for(int i=0;i<=25;i++)
printf("%c:%d\n",i+'a',c[i]);
return 0;
}
#include<stdio.h>
int main(){
int c[26]={0},i;
char ch;
while((ch=getchar())!='\n')
if(ch >= 'a' && ch<= 'z')
c[ch-'a']++;
for(int i=0;i<=25;i++)
printf("%c:%d\n",i+'a',c[i]);
return 0;
}