#include<iostream>
#include<cstring>
#include<algorithm>
#include<ctime>
using namespace std;
const int MAXN=10010;
int main()
{
char s[MAXN];
int i=0,n=0;
while( (s[n]=getchar() ) !='\n')
{
n++;
}
n--;
while(s[i] == s[n-i])
i++;
if(i>n/2) cout<<"Yes"<<endl;
else cout<<"NO"<<endl;
system("pause") ;
return 0;
}