INCLUDE 'EMU8086.INC'
.model small
.stack 100h
.data
main proc
    PRINTN "INPUT",13

    mov ah,1
    int 21h
    mov bl,al

    PRINTN "OUTPUT : ",13

    cmp bx,97
    jge small_to_big

        add bl,32
        mov ah,2
        mov dl,bl
        int 21h
        jmp exit

        small_to_big:
            sub bl,32
            mov ah,02
            mov dl,bl
            int 21h
            jmp exit

        exit:
        mov ah,4ch
        int 21h

     main endp
    end main
   ret