Не могу сделать ввод переменных пользователем

.model small
 
swapb macro a,b
mov al,a
mov ah,b
mov b,al
mov a,ah 
endm
 
swapw macro a,b
mov ax,a
mov bx,b
mov b,ax 
mov a,bx 
endm
scanw macro data
mov ah,0ah
lea dx,data
int 21h
endm
printw macro data
lea dx,data  
mov ah,09h
int 21h
endm
num macro data
mov ax,data+1
mov bx,data+2  
and ax,0F00h
and bx,0F00h
shl ah,4
        shr bx,8
        add bl,ah
endm
crlf macro 
lea  dx,CR
mov ah,09h
int 21h
endm
org 100h
.data
 
 
a    dw 0045h;548
b    dw 000Dh
c    dw 0005h
d    dw 0002h
k    dw 0015h
l    dw 0012h
result dw 0000h
[COLOR="DarkRed"]ea db 13,10,'Enter a:$'
eb db 13,10,'Enter b:$'
ec db 13,10,'Enter c:$'
ed db 13,10,'Enter d:$'
ee db 13,10,'Enter k:$'
ef db 13,10,'Enter l:$'[/COLOR]
text dB 13,10,'(((a+b)+(c-d))/k)+10=$'
;44H*eH/7-45H=88h-45h=43h
space db 09h
CR db 13,10,'$'
.code
  mov ax,@data
  mov ds,ax
printw text
 
mov ax,a
mov bx,b
add ax,bx
mul bx
mov bx,c
mov dx,d
sub bx,dx
div k
 
mov bx,l
add ax,bx
mov result,ax
    mov ah,0Ah
    int 21H
 
    mov ah,4ch
    int 21H
 
 
    end