How can I type letters in serial-mon and save the input in a global array ?Can anyone guide me in the right direction?

For example, I am trying to create a program where there are multiple questions on serial-mon and the user can input his/her answer in.
"How to spell 1?" 
one (this is the answer)
"How to spell 30?"
thirty (this is the answer)

I am trying to make my serial- mon page look like that. 

Do a Google search with this:

arduino playground serial monitor string input output
Check the first few links, read the code and follow links where interested.
Should get you going in notime ;)

There are things called ANSI codes which allow you to move the cursor around the screen and selectively add and delete from it.