How do I print the output after adding two number in assembly

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assembler

I am trying to add two number, because of the adding result is in ASCII, I added 'AAA' to correct the result, but i can't print the result which is store in AL on screen because I need Interrupt 21-service 9 to print. Then I copy AX to DX, but it doesn't work.. What's wrong?

ORG 100h MOV AL,39h
MOV BL,35h
ADD AL,BL
AAA
MOV DX,AX
MOV AH,9
INT 21h
RET

Thanks,

-Rudy