Use Bracket Notation to Find the NthtoLast Character- in a String

What i do wrong van you help me??

Your code so far

// Example
var firstName = "Ada";
var thirdToLastLetterOfFirstName = firstName[firstName.length - 3];

// Setup
var lastName = "Lovelace";

// Only change code below this line
var secondToLastLetterOfLastName = lastName[lastName.length - 3];


Your browser information:

Your Browser User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36.

Link to the challenge:
https://www.freecodecamp.org/challenges/use-bracket-notation-to-find-the-nthtolast-character-in-a-string

you’re returning the third to last letter.
Should be -2 instead of -3

var secondToLastLetterOfLastName = lastName[lastName.length -2];

Now i understand thank you