#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
int main()
{
    string word1,word2;
    cin>>word1;
    word2=word1;
    //reverse(word1.begin(),word2.end());
    for(int i=0;i<=str.length();i--)
    {
        cout<<word[i];
    }
    if(word1==word2)
    {
        cout<<"YES";
    }
    else
    {
        cout<<"NO";
    }
}