#include <iostream>
#include <string>
using namespace std;
int main(){
    string s;
    getline(cin,s);
    string rev="";
    for(int i=0;i<s.length();i--){
        if(isdigit(s[i]) && isalpha(s[i]){
            rev+=s[i];
        }
        else{
            cout<<"Invalid input";
        }
    }
    if(s==rev){
        cout<<"YES";
    }
    else{
        cout<<"NO";
    }
    return 0;
}