I remember this all too well. I tried to get my mum who as a touch typist to type them in for me, but she soon told me where to go.
http://en.wikipedia.org/wiki/MLX_(software)
I told her that after she entered the line that the computer would tell her if it was right or not. She said, "Well if the computer knows what to type in, why doesn't it type it in?" I think I discovered then at 10 years old the difference between a P and NP problem.