Pangrams

Pangrams are sentences constructed by using every letter of the alphabet at least once.

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


int main() {
    int count=0;
    int c,i,a[27]={0};char b[1000];
    scanf("%[ !-z]266s",b);
   // printf("%s",b);
  /*  for(i=0;i<strlen(b);i++)
    {
        printf("%c ",b[i]);
    }printf("\n");
*/
    for(i=0;i<strlen(b);i++)
    {
        a[26]=b[i];//printf("%c ",a[26]);
        if(a[26]>=65&&a[26]<=90)
        {   c=(a[26]-64)-1;
            if(a[c]!=1)
            {
                a[c]=1;//printf("\ni is %d \n",i);
                ++count;
            }
        }
        if(a[26]>=97&&a[26]<=122)
        {    c=(a[26]-96)-1;
            if(a[c]!=1)
            {
                a[c]=1;
                ++count;
            }
        }
        if(count==26)
        {
            printf("pangram");
            goto bottom;
        }
    }
    printf("not pangram");
    bottom: 
   // printf("%d",count);
    return 0;
}



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