A_Z IS Right Others CHARACTER IS WRONG in Assmbly

.MODEL SMALL
.STACK 100H
.DATA

MSG1 DW "SAMPLE INPUT: $"
MSG2 DW "YOUR INPUT CHARACTER IS RIGHT. $"
MSG3 DW "YOU INPUT A WRONG CHARACTER. $"

.CODE
MAIN PROC

    MOV AX,@DATA
    MOV DS,AX

    MOV AH,9
    LEA DX,MSG1
    INT 21H

    MOV AH,1
    INT 21H
    MOV BL,AL

    MOV AH,2
    MOV DL,0AH
    INT 21H
    MOV DL,0DH
    INT 21H

    CMP BL,5AH
    JG ERROR
    CMP BL,41H
    JL ERROR2

    MOV AH,9
    LEA DX,MSG2
    INT 21H
    JMP END_IF

    ERROR:
    MOV AH,9
    LEA DX,MSG3
    INT 21H
    JMP END_IF

    ERROR2:
    MOV AH,9
    LEA DX,MSG3
    INT 21H

    END_IF:
    MAIN ENDP
END MAIN