#define _USE_MATH_DEFINES
#include<stdio.h>
#include<string>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include<iomanip>
using namespace std;


int main(){
	string a,b;
	reverse(b.begin(),b.end());
	if(a==b)cout<<"YES"<<endl;
	else cout<<"NO"<<endl;


	return 0;
}