.model  small
.data
msg1    db      'please input 5 characters',13,10,'$'
msg2    db      10,?,10 dup(?)
msg3    db      'please input 1 digit ',13,10,'$'
msg4    db      'please input 2 digit ',13,10,'$'
msg5    db     'the result is: ',13,10,'$'
.code
start:
        mov     ax,@data
        mov     ds,ax
        mov     dx, offset msg3
        mov     ah,9
        int     21h
        mov     ah,1
        int     21h
        sub     al,30h
        mov     bl,al
        mov     dx, offset msg4
        mov     ah,9
        int     21h
        mov     ah,1
        int     21h
        mov     bh,al
        mov     dx,offset msg5
        mov     ah,9
        int     21h
        mov     al,bh
        sub     al,30h
        add     al,bl
        add     al,30h
        mov     dl,al
        mov     ah,02
        int     21h
        mov     ah,4ch
        int     21h

end     start
        end