#include<bits/stdc++.h>
using namespace std;
const int N=110;
char s[N];
int main()
{
	cin.getline(s,N);
	int n=strlen(s);
	for(int i=0,j=n-1;i<j;i++,j--) //首尾往中靠 
	{
		if(s[i]!=s[j]) //不相同 
		{
			cout<<"no";
			return 0;
		}
	}
	cout<<"yes";
return 0;
}

#include<bits/stdc++.h>
using namespace std;
const int N=110;
char s[N];
int main()
{
	cin.getline(s,N);
	int n=strlen(s);
	for(int i=0,j=n-1;i<j;i++,j--) //首尾往中靠 
	{
		if(s[i]!=s[j]) //不相同 
		{
			cout<<"no";
			return 0;
		}
	}
	cout<<"yes";
return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
    string s;
    cin>>s;
    string s1=s;
    reverse(s1.begin(),s1.end());
    if(s1==s) cout<<"yes";
    else cout<<"no";
    return 0;
}

#include <bits/stdc++.h> using namespace std; const int N=10; char s[N]; int main() { cin.getline(s,N); int n=strlen(s); for(int i=0,j=n-1;i<j;i++,j--) { if(s[i]!=s[j]) { cout<<"no"; return 0; } } cout<<"yes"; return 0; }

#include<bits/stdc++.h> using namespace std; const int N=1000; char s[N]; int main() { cin.getline(s,N); int n=strlen(s); for(int i=0,j=n-1;i<j;i++,j--) { if(s[i]!=s[j]) { cout<<"no"; return 0; } } cout<<"yes"; return 0; }