Question

@Diyadiya here is the code for reversing string

Answer 1

.MODEL SMALL
.STACK 100H
.DATA
msg DB 0AH,0DH,'=>is palindrome','$'
msg2 DB 0AH,0DH,'=>is not palindrome','$'
a DB ?
.CODE
MAIN PROC
mov ah, 2h
mov dl,'?'
int 21h

xor cx, cx
mov ah, 1h
int 21h
mov a, al
call palindrome
exit:
mov ah, 4ch
int 21h
MAIN ENDP

palindrome proc
while_:
cmp al, 0dh
je end_while
push ax
inc cx
int 21h
jmp while_
end_while:
mov ah, 2h
mov dl, 0dh
int 21h
mov dl, 0ah
int 21h
jcxz exit
top:
pop dx
int 21h
loop top

cmp dl,a
je print
call print2
ret
print: call print1
ret
palindrome ENDP

print1 proc
mov ax,@DATA
mov ds,ax
mov dx,offset msg
mov ah,09
int 21h
ret
print1 endp

print2 proc
mov ax,@DATA
mov ds,ax
mov dx,offset msg2
mov ah,09
int 21h
ret
print2 endp

END MAIN

Answer 2

I'd rather use this http://textmechanic.com/Reverse-Text-Generator.html