#include<bits/stdc++.h>
using namespace std;
char a[1005];
int main(){
	int x=0,y=1;
    cin>>a;
    for(int i=strlen(a)-1;i>=0;i--){
    	if(a[x]==a[i]){
    		x++;
		}else{
			y=0;
			break;
		}
	}if(y==1){
		cout<<"YES"<<endl;
	}else if(y==0){
		cout<<"NO"<<endl;
	}return 0;
}