#include<stdio.h>
#include<ctype.h>

int fun(char *s, char c)
{
    int i, k=0;

    c=toupper(c);
    for (i=0; s[i]!='\0'; i++) {
        if (toupper(s[i])==c)
         k++;
        }
    return k;  
    
    }

int main()
{
    char str[30], ch;
    int i, k=0;

    printf("Inserire una stringa\n");
    scanf("%[A-Za-z ]", str);
    getchar();
    printf("Inserire un carattere\n");
    scanf("%c", &ch);
    for (i=0; str[i]!='\0'; i++) {
        if (toupper(str[i])==toupper(ch))
         k++;
        }
    printf("la lettera %c appare in \"%s\" %d volte\n",ch,str,fun(str,ch));
    return 0;
}