import java.util.*;
class Main {
public String solution(String str) {
String answer = "YES";
str.toLowerCase();
for (int i = 0; i < str.length() / 2; i++) {
if (str.charAt(i) == str.charAt(str.length() - i - 1)) {
answer = "YES";
} else {
answer = "NO";
}
}
return answer;
}
public static void main(String[] args) {
Main T = new Main();
Scanner sc = new Scanner(System.in);
String str = sc.next();
System.out.println(T.solution(str));
}
}
이게 왜 오류나는지 궁금합니다...