hackealo.co solucionador. SPOILER: Aunque pongas la respuesta correcta no funciona

gistfile1.js

// "acb" es (1*1) + (2*3) + (3*2).
var letters = ['a','b','c','d','e','f','g','h','i','j','k','l',
'm','n','o','p','q','r','s','t','u','v','w','y','x','z',
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
'Q','R','S','T','U','V','W','Y','X','Z'];

// var word = 'HZyVYIW'.toLowerCase().split('');
var word = 'HZyVYIW'.split('');
var total = 0;
var msg = '';
word.forEach(function(letter,index){
	msg = ((index+1)+' * '+parseInt(letters.indexOf(letter)+1));
	console.log(msg);
	total += (index+1)*(parseInt(letters.indexOf(letter)+1));
});
console.log(total);