public String ns() {
   int b = skip();
   StringBuilder sb = new StringBuilder();
   while (!(isSpaceChar(b))) { // when nextLine, (isSpaceChar(b) && b != // ' ')
     sb.appendCodePoint(b);
     b = readByte();
   }
   return sb.toString();
 }
 private String ns1() {
   int b = skip();
   StringBuilder sb = new StringBuilder();
   while (!(isSpaceChar(b) && b != ' ')) { // when nextLine,
     sb.appendCodePoint(b);
     b = readByte();
   }
   return sb.toString();
 }