static boolean isPerfectCubeString ( String str ) {
  int sum = 0 ;
  for ( int i = 0 ;
  i < str . length ( ) ;
  i ++ ) sum += ( int ) str . charAt ( i ) ;
  double cr = Math . round ( Math . cbrt ( sum ) ) ;
  return ( cr * cr * cr == sum ) ;
}

static boolean isPerfectCubeString ( String str ) { int sum = 0 ; for ( int i = 0 ; i < str . length ( ) ; i ++ ) sum += ( int ) str . charAt ( i ) ; double cr = Math . round ( Math . cbrt ( sum ) ) ; return ( cr * cr * cr == sum ) ; }
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