int i=0;
string aWord = "abcdf!";
 
while(aWord[i])
{
   if(isalpha(aWord[i]))
      printf ("character %c is alphabetic\n",aWord[i]);
   else
   {
	aWord.erase (i, 1);
      //..Is idx > length
       if(i>aWord.size())
          break;
       i--;
   }
   i++;
}
cout<<aWord;