Not able to assign value

I am unable to type the following statement for the Google interview section under string cartography.

let letter = string[i];

I am simply not able to type the above statement. Once I type the word string and try to insert bracket it just rewrites over string.

Hey there, use the purple square brackets [] key, which is used to access items. The orange [] key creates a new array, which is why it’s overwriting string.

Hope this helps, and good luck!
Ben

That worked, thank you very much for your quick response.

Regards

Mugunthan K