[SCRIPT] Please help

[OriginalUsername]

http://postimg.org/image/5iugezp9j/ 3 errors

When a error says main(15,20), the computer means there is something wrong in the 15th line, the 20th symbol. So you see: 'sting' is not a data type, so sting is nothing and it should be string.
when 'world' is not declared, it should be between "".
That should do it..I hope

Tip: I wouldn't type everything, just copy paste everything is a good way to prevent typos