Clearing the status bar or messages

Vim 7.3.514, Windows 7

With a status cmdheight of 1, if you do the following, you get the
dreaded "hit enter" prompt.

:echo 'a' | echo 'b'

a
b
Press ENTER or type command to continue

This is happening in one of my plugins, I am prompting the user for
input and using getchar().
Then I show them the value they typed in.

So,
let msg = "Choose a letter:"
echomsg msg
let c = getchar()
let c = nr2char(c)
echomsg msg.c

I will want to display their selection, but with the "Choose a letter:"
displayed, I would simply like to add a new line to the output, rather
than causing a new line to be displayed leading to the "hit enter" prompt.

Is there anyway I can clear the prompt, to prevent this?

Thanks,
Dave



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