include <bits/stdc++.h>

using namespace std;
int main(){
ios_base::sync_with_stdio(false);
cin.tie(0); cout.tie(0);
freopen("DOIXUNG.inp", "r",stdin);
freopen("DOIXUNG.out", "w", stdout);
string s;
cin>>s;
int n=s.length();
for (int]i=0; i<n / 2; i++) {
if (s[i != s[n-1-i]) {
cout<<"NO";
return 0;
}
}
cout << "YES";
return 0;
}