check number in range condition of assembly language

DATA SEGMENT
NUM1 DB ?
MSG1 DB 10,13,"ENTER THE NUMBER : $"
MSG2 DB 10,13," INTO THE RANGE : $"
MSG3 DB 10,13," OUT OF THE RANGE : $"

ENDS
CODE SEGMENT
ASSUME DS:DATA CS:CODE
START:

MOV AX,@DATA
MOV DS,AX

  LEA DX,MSG1
  MOV AH,9
  INT 21H

INPUT:
MOV AH,1
INT 21H
MOV BL,AL
SUB BL,48


CMP BL,3
JGE L2


L1:
LEA DX,MSG3
MOV AH,9
INT 21H
JMP EXIT

L2:
 CMP BL,8

 JNG L3
 JMP L1

 L3:

 LEA DX,MSG2
 MOV AH,9
 INT 21H


EXIT: MOV AH,4CH
INT 21H
ENDS
END START