.model small
.stack 100h
.data
.code
main proc
  mov ah,1
  int 21h
  mov bl,al
  
  mov ah,1
  int 21h
  mov dl,al
  
  add dl,bl
  sub dl,48
  
  mov ah,2
  int 21h
  
  mov ah,4ch
  int 21h

main endp
end main