#include<stdio.h>
#define ALPHABET 26
int main ()
 {
char string[ALPHABET] = "abcdefghijkmnlopqrstuvwxyz";
char perm [ALPHABET];
int i;
 int distance;
 int flag=1;
printf("Enter ABC permutationn");
for(i=0;i<ALPHABET;i++)
{
 scanf("%c",& perm[i]);
}

distance = (int)perm[0] - (int)string;

for(i=0;i<ALPHABET;i++)
{

     if ( ((int)perm[i] - (int)string[i]) != distance )
    {
    flag = 0;
    break;
    }
   }

  if (flag)
  {

printf("your input is invalid permutationn");
   }


else


{
printf("your input is valid permutationn");
}

 return 0;
 }

char string [a,b,c,d,e,f,g,h,i,j,k,m,n,l,o,p,q,r,s,t,u,v,w,x,y,z];

char string[] = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};

char string[] = "abcdefghijkmnlopqrstuvwxyz";