#include<bits/stdc++.h> 
using namespace std;
int main(){
    int n,a,g,s,b,q;
	cin>>a;
	g=a%10;
	s=a/10%10; 
	b=a/100%10;
	q=a/1000; 
	n=g*1000+s*100+b*10+q;
	if(a==n+1000<n<9999){
		cout<<"yes";
	}else{
		cout<<"no";
	}
} 
/**************************************************************
	Problem: 1647
	User: yangjunwen
	Language: C++
	Result: Wrong Answer
****************************************************************/