#include <iostream>
#include <stdio.h>
#include <ctype.h>
using namespace std;
int main()
{
// your code goes here
int counts[30]={0};
char cs[1201];
while(scanf("%[^\n]\n",cs)!=EOF){
for(int i=0;cs[i]!='\0';i++){
if(isalpha(cs[i])){
counts[tolower(cs[i])-'a']++;
}
}
}
for(char c='a';c<='z';c++){
printf("%c : %d\n",c,counts[c-'a']);
}
return 0;
}