import java.util.Scanner;

class Entrada {
	String entrada = new String();

	Entrada(Scanner in){
		entrada = in.nextLine();
	}

	boolean testaPalindrome(String entrada){
		if(entrada.length()==1){
			return true;
		}
		else if(entrada.length()==2){
			if(entrada.charAt(0)==entrada.charAt(1)){
				return true;
			}
			else{
				return false;
			}
		}
		else{
			for(int i=0;i<entrada.length()/2; i++){
					if(entrada.charAt(i)!=entrada.charAt(entrada.length()-1-i)){
						return false;
					}
				}
			return true;
			}
		}
	}

public class verificaPalindrome{
	public static void main(String[] args){
		Scanner in = new Scanner(System.in);
		Entrada inp = new Entrada(in);

		if(true==inp.testaPalindrome(inp.entrada)){
			System.out.println("Sim");
		}
		else{
			System.out.println("Nao");
		}