#include <iostream>
using namespace std;
int main(){
freopen("p1033.in","r",stdin);
freopen("p1033.out","w",stdout);
int n,a,b,c,d;
cin>>n;
a=n%10;
b=n/10%10;
c=n/100%10;
d=n/1000;
if(a==d&&b==c)cout<<"yes";
else cout<<"no";
fclose(stdin);
fclose(stdout);
return 0;
}
( 2026/6/4 17:08:23 ) |