Adding two number in assembly language

.MODEL SMALL
.STACK 100H

.DATA
G1 DB 'ENTER FIRST NUMBER: $'
G2 DB 'ENTER SECOND NUMBER: $'
G3 DB 'ADDITION RESULT IS: $'

.CODE
MAIN PROC

MOV AX,@DATA
MOV DS,AX

LEA DX,G1
MOV AH,9
INT 21H

MOV AH,1
INT 21H

MOV BL,AL

LEA DX,G2
MOV AH,9
INT 21H

MOV AH,1
INT 21H

MOV CL,AL

LEA DX,G3
MOV AH,9
INT 21H

SUB BL,30H
SUB CL,30H

ADD CL,BL
ADD CL,30H

MOV DL,CL
MOV AH,2
INT 21H

MOV AH,4CH
INT 21H

MAIN ENDP
END MAIN