take uppercase input print next 3 lowercase output,not x,y,z

.MODEL SMALL

.STACK 100H

.DATA
MSG1 DB "ENTER YOUR FIRST LETTER : $"
MSG2 DB "ENTER YOUR SENCOND LETTER : $"
.CODE

MAIN PROC
;INITIALIZE DS
    MOV AX,@DATA
    MOV DS,AX
;DISPLAY MESSAGE
    LEA DX,MSG1
    MOV AH,9
    INT 21H
;INPUT A CHARACTER
    MOV AH,1
    INT 21H
    MOV BL,AL;
;PRINT LINE FEED AND NEW LINE
    MOV AH,2
    MOV DL,0DH
    INT 21H
    MOV DL,0AH
    INT 21H
;DISPLAY CHARACTER

    ;FIRST
    MOV DL,BL
    ADD DL,020H
    ADD DL,01H
    INT 21H

    ;PRINT LINE FEED AND NEW LINE
    MOV DL,0DH
    INT 21H
    MOV DL,0AH
    INT 21H

    ;SECOND
    MOV DL,BL
    ADD DL,020H
    ADD DL,02H
    INT 21H

    ;PRINT LINE FEED AND NEW LINE
    MOV DL,0DH
    INT 21H
    MOV DL,0AH
    INT 21H

    ;THIRD
    MOV DL,BL
    ADD DL,020H
    ADD DL,03H
    INT 21H

    ;PRINT LINE FEED AND NEW LINE
    MOV DL,0DH
    INT 21H
    MOV DL,0AH
    INT 21H
;--------------------------------------

    ;DISPLAY MESSAGE
    LEA DX,MSG2
    MOV AH,9
    INT 21H
    ;INPUT A CHARACTER
    MOV AH,1
    INT 21H
    MOV BL,AL;
    ;PRINT LINE FEED AND NEW LINE
    MOV AH,2
    MOV DL,0DH
    INT 21H
    MOV DL,0AH
    INT 21H
;DISPLAY CHARACTER

    ;FIRST
    MOV DL,BL
    ADD DL,020H
    ADD DL,01H
    INT 21H

    ;PRINT LINE FEED AND NEW LINE
    MOV DL,0DH
    INT 21H
    MOV DL,0AH
    INT 21H

    ;SECOND
    MOV DL,BL
    ADD DL,020H
    ADD DL,02H
    INT 21H

    ;PRINT LINE FEED AND NEW LINE
    MOV DL,0DH
    INT 21H
    MOV DL,0AH
    INT 21H

    ;THIRD
    MOV DL,BL
    ADD DL,020H
    ADD DL,03H
    INT 21H

    ;PRINT LINE FEED AND NEW LINE
    MOV DL,0DH
    INT 21H
    MOV DL,0AH
    INT 21H

;RETURN TO DOS

    MOV AH,4CH
    INT 21H

MAIN ENDP

END MAIN