Big number among two numbers.

Write an Assembly Language Program to get largest number among two numbers.

data segment
ms1 db "a is largest number","$"
ms2 db "b is largest number","$"
a db 10h
b db 20h
ends
stack segment
    dw   128  dup(0)
ends
code segment
start:
mov ax,@data
mov ds,ax
mov al,a
mov bl,b
cmp al,bl
jg Big_a 
mov ah,09
mov dx,offset ms2
int 21h
jmp Exit1
Big_a:
mov ah,09
mov dx,offset ms1
int 21h
Exit1:
mov ax, 4c00h
int 21h
ends
end start

OUTPUT : b is largest number