const getGets = (arr) => {
  let index = 0;

  return () => {
    const toReturn = arr[index];
    index += 1;
    return toReturn;
  };
};
// this is the test
const test = ['t_alk', 'ha lar'];

const gets = this.gets || getGets(test);
const print = this.print || console.log;

let englishWord = gets();
let spanishWord = gets();

const endIndex = Math.max(englishWord.length, spanishWord.length);

let message = '';

for (let i = 0; i < endIndex; i++) {
  if (i >= englishWord.length) {
    message += spanishWord.substr(i);
    break;
  }

  if (i >= spanishWord.length) {
    message += englishWord.substr(i);
    break;
  }

  let engishLetter = englishWord[i];
  let spanishLetter = spanishWord[i];

  if (engishLetter === '_' || engishLetter === ' ') {
    message += engishLetter;
    continue;
  }

  if (spanishLetter === '_' || spanishLetter === ' ') {
    message += spanishLetter;
    continue;
  }

  let englishAsciiCode = engishLetter.charCodeAt(0);
  let spanishAsciiCode = spanishLetter.charCodeAt(0);

  let newCode = 97 + Math.abs(englishAsciiCode - spanishAsciiCode);
  let newLetter = String.fromCharCode(newCode);

  message += newLetter;
}

print(message);