#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

#define TOLOWER 32
#define LETTER_START 97
#define ALPHABET_SIZE 26

char toLowerCase (char character);

int main (int argc, char *argv[]) {
    char readChar;
    int arrayPos = 0;

    readChar = toLowerCase(getchar());

    int alphabetFreq[26] = {0};

    while (readChar != -1) {
        if (readChar >= 'a' && readChar <= 'z') {
            arrayPos = readChar - LETTER_START;
            alphabetFreq[arrayPos]++;
            //printf ("%c = %d\n", readChar, arrayPos);
        }
        readChar = toLowerCase(getchar());
    }

    char startChar = 'a';
    int count = 0;
    while (count < ALPHABET_SIZE){
        printf("%c : %d\n", startChar, alphabetFreq[count]);
        startChar ++;
        count ++;
    }
    return EXIT_SUCCESS;
}

char toLowerCase (char character) {
    if (character >= 'A' && character <= 'Z') {
        character += TOLOWER;
    }

    return character;
}