def f(anna):
li = str(n)
if len(li) in (1, 0):
return True
elif li[-1] == li[0]:
li = li[1:-1]
return f(li)
else:
return False
ZGVmIGYoYW5uYSk6CiAgICBsaSA9IHN0cihuKQogICAgaWYgbGVuKGxpKSBpbiAoMSwgMCk6CiAgICAgICAgcmV0dXJuIFRydWUKICAgIGVsaWYgbGlbLTFdID09IGxpWzBdOgogICAgICAgIGxpID0gbGlbMTotMV0KICAgICAgICByZXR1cm4gZihsaSkKICAgIGVsc2U6CiAgICAgICAgcmV0dXJuIEZhbHNl