const answer = (checkWords) => {
  const [firstWord, secondWord] = checkWords.split(' ');
  if (firstWord.length !== secondWord.length) {
    return 0;
  }
  const sortedFirstWord = [...firstWord].sort();
  const sortedSecondWord = [...secondWord].sort();
  for (let i = 0; i < firstWord.length; i++) {
        if ((sortedFirstWord[i] !== sortedFirstWord[i - 1] && sortedSecondWord[i] === sortedSecondWord[i - 1])
            || (sortedFirstWord[i] === sortedSecondWord[i - 1] && sortedSecondWord[i] !== sortedSecondWord[i - 1]))
            return 0;
    }
    return 1;
}