#include <iostream>
using namespace std;
int main()
{
char *s;
int flag=0,c=0;
cin>>s;
for(int i=0;s[i];i++)
{
c++;
}
for(int i=0;i<c-i;i++)
{
if(s[i]==s[--c])
flag=1;
else{ flag=0;
break;}
}
if(flag==1) cout<<"YES";
else cout<<"NO";
return 0;
}
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