#include <stdio.h>

int main(void)
{
     char letter1;
     char letter2;
     int start;
     int end;
     int current;
     
     printf("Enter two characters: ");
     scanf("%c%c", &letter1, &letter2);
     start = (int)letter1;
     end = (int)letter2; 
     
     for(current = start; current <= end; current++)
     {
            printf("%c", (char)current);
     }         
     printf("\n");

     return (0);
}