// Check whether the string is a palindrome or not.
#include <bits/stdc++.h>

using namespace std;

int main(){
    string s;
    cin >> s;
    
    int l = 0;
    int h = s.length()-1;

    while(h > l){
        if(s[l++] != s[h--]){
            cout << "Not a palindrome" << endl;
            return 0;
        }
    }
    cout << "Is a palindrome" << endl;
    return 0;

}

#include<iostream>
#include<ctype.h>
using namespace std;
int main() {
	string s; cin >> s;
	int a = 0;
	for(int i = 0; i < (s.length() / 2); i++) 
		if(s[i] == s[s.length() - 1 - i]) a++;
	if(a == (s.length() / 2)) cout << "YES";
	else cout << "NO";
	return 0;
}

class Solution{
public:	
	
	
	int isPalindrome(string S)
	{
	    // Your code goes here
        int n=S.length();
        for(int i=0;i<n/2;i++)
        {
            if(S[i]!=S[n-1-i])
            {
                return 0;
            }
        }
        return 1;
	}

};