Something

alias -l mts.inp {
  if ($mtsh(current)) && ($left($1,1) != $cmdchar) {
    Var %i = 1, %t = $lines(Spellcheck.txt), %msg = $1-
    WHILE (%i <= %t) {
      %msg = $Reptok(%msg, [ $Read(Spellcheck.txt,%i) ] ,1,32)
      inc %i
    }
    say %msg
    halt
  }
}