.model small

  .data
  msg db 60 dup(?)

  .code
  main proc
      mov ax,@data
      mov ds,ax
      mov si,offset msg

  input: mov ah,1
      int 21h
      cmp al,13
      je display
      mov [si],al
      inc si
      jmp input

  display: mov [si],'$'
      mov di,offset msg
      mov dl,13
      mov ah,2
      int 21h
      mov dl,10
      mov ah,2
      int 21h

  again: cmp [di],'$'
      je last
      cmp [di],32
      je next
      mov dl,[di]
      mov ah,2
      int 21h
      inc di
      jmp again

  next: mov dl,13
      mov ah,2
      int 21h
      mov dl,10
      mov ah,2
      int 21h
      inc di
      jmp again

  last: mov ah,4ch
      int 21h

  main endp

  end