#include <iostream>
#include <bits/stdc++.h>
using namespace std;

bool Palindrom(string s){
if(s.length()<=1){
    return true;}else{
    char primul=s[0];
    char ultimul=s[s.length()-1];
    if(primul==ultimul){
        string mijloc=s.substr(1,s.length()-2);
        bool tt=Palindrom(mijloc);
        return tt;
    }
    else{return false;}}
}
int main(){
string s;
cin>>s;
cout<<Palindrom(s);}