2A-1

.model small
.data

A db ?




.code
main proc
    mov ah,1
    int 21h

    mov A, al
    int 21h

    mov bh, A
    add bh, A
    sub bh, 49


    Mov ah, 2

    mov dl, 0ah
    int 21h

    mov dl, 0dh
    int 21h

    mov dl, bh
    int 21h

    mov ah, 4ch
    int 21h
    main endp
end main