#41281: python


suyueh (suyueh)


a=input()
b="".join(reversed(a))
if a==b:
  print("yes")
else:
  print("no")
#54097: Re: python


boy0399@gmail.com (fantasy_whale)


s=input()
if s==s[::-1]:
print("yes")
else:
print("no")