Create a function that takes a number as an argument and returns a grade based on that number.

> 
> Score Grade
> 
> 
> Anything greater than 1 or less than 0.6 'F'
> 
> 
> 0.9 or greater "A"
> 
> 
> 0.8 or greater "B"
> 
> 
> 0.7 or greater "C"
> 
> 
> 0.6 or greater "D"
> 
> 
> 

I was trying to figure out another way to write this code because the interpreter won't accept it. Can someone assist me with this?

```
def grader(score)
  if score >= 0.9 
    return "A"
  elsif score >= 0.8 
    return "B"
  elsif score >= 0.7  
    return "C"
  elsif score >= 0.6  
    return "D"
  elsif score < 0.5 or score > 1.01 
    return "F"
  else
    return "O"
  end
end

```