function lisaCipher(keyword, msg) {
    var alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
    var plainText = "";
    var remainderAlphabet = alphabet.split("");
    var plainAlphabet = alphabet.split("");
    var cypherAlphabet = [];
    var cypherChars = ((keyword.replace(/\s/g, '')).toUpperCase()).split("");
    var msgText = msg.toUpperCase().split("");
    for (i=0; i < cypherChars.length;i++) {
        if (cypherAlphabet.includes(cypherChars[i]) === false) {
          cypherAlphabet.push(cypherChars[i]);
        }
    }
    remainderAlphabet = remainderAlphabet.filter(char => cypherAlphabet.includes(char) === false);
    remainderAlphabet.forEach(char => cypherAlphabet.push(char));
    for (char of msgText) {
      if (plainAlphabet.includes(char) === false) {
        plainAlphabet.push(char);
        cypherAlphabet.push(char);
      }
      plainText = plainText + plainAlphabet[cypherAlphabet.findIndex(cipherChar => cipherChar === char)];
    }    
    return plainText;
    
}