Use AT to place it on a specific part of the screen. Use LEFT/RIGHT/SUBSTR to split up your string and splice it back together.

code:
$text='whatever'
at (1,1) $text
$a=0
while not $key
  $text=substr($text,2)+right($a,1)
  at (1,1) $text
  get $key
loop
or something like it
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There are two types of vessels, submarines and targets.