#include <stdio.h>
char this_word[100];

int main()
{
   int  howmany;
   int  found_hello = 0;

   howmany = fscanf(stdin, "%s", &this_word[0]);

   while (howmany == 1)
   {
       if (isHello(&this_word[0]))
          found_hello = 1;

       howmany = fscanf(stdin, "%s", &this_word[0]);
   }

   if (found_hello)
      fprintf(stdout, "yes\n");
   else
      fprintf(stdout, "no\n");
   return(0);
}