#include <iostream>
#include<string>
using namespace std;
int main() {
string s;
cin>>s;
bool b=0;
for(int i=0;i<=s.length()/2;i++)
{
if(s[i]!=s[s.length()-i-1])
{
b=1;
break;
}
}
if(b==1)
cout<<"NO";
else
cout<<"YES";
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZTxzdHJpbmc+CnVzaW5nIG5hbWVzcGFjZSBzdGQ7CiAKaW50IG1haW4oKSB7CglzdHJpbmcgczsKCWNpbj4+czsKCWJvb2wgYj0wOwoJZm9yKGludCBpPTA7aTw9cy5sZW5ndGgoKS8yO2krKykKCXsKCQlpZihzW2ldIT1zW3MubGVuZ3RoKCktaS0xXSkKCQl7CgkJCWI9MTsKCQkJYnJlYWs7CgkJfQoJfQoJaWYoYj09MSkKCWNvdXQ8PCJOTyI7CgllbHNlCgljb3V0PDwiWUVTIjsKCXJldHVybiAwOwp9