She's got a concept of addition and subtraction. I typed in the number and prefixed it with I am putting a funny symbol before, and said they were before zero

She's got a concept of addition and subtraction. I typed in the number and prefixed it with I am putting a funny symbol before, and said they were before zero and that normal numbers had a plus in front but it's hidden normally, then I asked which way do you think this will go and she pointed left.