```
#include <stdio.h>
#include <ctype.h>
 
void count_characters() {
    char text[100];
    printf(": ");
    fgets(text, 100, stdin);
 
    int char_count[26] = {0};
    for (char *p = text; *p; p++) {
        if (isalpha(*p)) {
            char_count[tolower(*p) - 'a']++;
        }
    }
 
    printf(": \n");
    for (int i = 0; i < 26; i++) {
        if (char_count[i]) {
            printf("%c: %d\n", i + 'a', char_count[i]);
        }
    }
}
 
int main() {
    count_characters();
    return 0;
}
```

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