code to take 3 char input and print them in reverse way

reverse.asm

        ;code to take 3 char input and print them in reverse way
    
        .model small
        .stack 100h
        .data
        
             input db 'INPUT: $'
             output db 'OUTPUT: $'
              
        .code
        
            main proc
              
              mov ax,@data      ;prepare data segment
              mov ds,ax
                                         
              mov ah,09h        ;print string
              lea dx,input      ;load offset address of input
              int 21h
              
              mov ah,01h        ;input char
              int 21h
              mov cl,al
              int 21h
              mov ch,al
              int 21h
              mov bl,al
              
              mov ah,02h        ;newline and cret
              mov dl,0Ah
              int 21h
              mov dl,0Dh
              int 21h
                                ;print string 
              mov ah,09h
              lea dx,output    
              int 21h
              
              mov ah,02h        ;output char
              mov dl,bl         ;reverse
              int 21h
              mov dl,ch         
              int 21h
              mov dl,cl
              int 21h 
                     
              mov ah,4ch        ;terminate
              int 21h
             
           main endp
           end main