import java.io.*;
import java.util.Arrays;
class Main{
    public static void main(String[] args) throws IOException {
        int i,tmp;
        int[] A = new int[100];
        String str;
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        for(;(str=in.readLine())!=null;){
            char[] c = str.toCharArray();
            for(i=0;i<c.length;i++){
                tmp = (int)c[i];
                if(64 < tmp && tmp <91) tmp+=32;
                tmp-=97;
                if(tmp < 0 || 27 < tmp) continue;
                A[tmp]+=1;
            }
        }
        for(i=0;i<26;i++){
            System.out.println((char)(97+i)+" : "+A[i]);
        } 
        System.out.flush();
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz