Task 3

#include <stdio.h>

int main() {
    char string[1000];
    fgets(string, 1000, stdin);

    int ascii_letters[26];

    int i;
    for(i = 0; i < 26; i++) {
        ascii_letters[i] = 0;
    }

    for(i = 0; string[i] != '\n'; i++) {
        int ascii_letter = string[i];

        if((ascii_letter >= 'a' && ascii_letter <= 'z') || (ascii_letter >= 'A' && ascii_letter <= 'Z')) {
            if(ascii_letter >= 'A' && ascii_letter <= 'Z') {
                ascii_letter += 32;
            }

            int letter_num = ascii_letter - 'a';
            ascii_letters[letter_num]++;
        }
    }

    for(i = 0; i < 26; i++) {
        if(ascii_letters[i] > 0) {
            char ascii_letter = i + 'a';
            printf("%c - %d\n", ascii_letter, ascii_letters[i]);
        }
    }

    return 0;
}