ALP to evaluate arithmetic expression

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ASSUME CS:CODE,DS:DATA ; EVALUATION OF EXPRESSION E= (A+B)-(C+D)
DATA SEGMENT
STR DB 0AH,"ENTER NUMBER :$"
STR2 DB 0AH,"$"
NUM DB ?
DATA ENDS
CODE SEGMENT
START:
 MOV AX,DATA
 MOV DS,AX

 MOV CX,4H
 LEA SI,NUM
 L:
 LEA DX,STR
 MOV AH,09H
 INT 21H
 MOV AH,01H
 INT 21H
 SUB AL,30H
 MOV [SI],AL
 INC SI
 LOOP L

 LEA SI,NUM
 MOV AL,[SI]
 ADD AL,[SI+1]

 MOV BL,[SI+2]
 ADD BL,[SI+3]
 ;NEW LINE START
 LEA DX,STR2
 MOV AH,09H
 INT 21H
 ;NEW LINE END
 SUB AL,BL
 ADD AL,30H
 MOV DH,00H
 MOV DL,AL
 MOV AH,02H
 INT 21H

 MOV AH,4CH
 INT 21H
CODE ENDS
END START

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