Print Only A-Z & a-z......Assembly Language

.MODEL SMALL
.STACK 100H
.DATA
.CODE
MAIN PROC
    MOV AH,1
    INT 21H

    CMP AL,41H
    JL EXIT

    CMP AL,5AH
    JG EXIT


    MOV AH,2
    MOV DL,AL
    INT 21H

    EXIT:

    CMP AL,61H
    JL TERMINATE

    CMP AL,7AH
    JG TERMINATE

    MOV AH,2
    MOV DL,AL
    INT 21H

 TERMINATE:

 MAIN ENDP
END MAIN