isLetter(char ch) { return ('a' <= ch && ch <= 'z') || ('A' <= ch && ch <= 'Z'); }
private static boolean isLetter(char ch) { return ('a' <= ch && ch <= 'z') || ('A' <= ch && ch <= 'Z'); }
   isLetter(char ch)      {      return ('a' <= ch && ch <= 'z') ||              ('A' <= ch && ch <= 'Z');      }