#include<bits/stdc++.h>
using namespace std;
int s;string a;
int main(){
    cin>>a;
    s=a.size()-1;
	for(int i=0,j=s;i<=j;i++,j--){
		if(a[i]-'0'!=a[j]-'0'){
			cout<<"no";return 0;
		}
	}cout<<"yes";
	 
	return 0;
}