#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
int main(){
    string str ;
    cin>>str;
    for(int i=0;i<str.length();i++){
        if(str[i]=='-'||str[i]=='.'){
            cout<<"Invalid input";
        return 0;
        }
    }
    
    string rev= str;
    reverse(rev.bigin(),rev.end());
    if(str==rev){
        cout<<"YES";
        
    }else{
        cout<<"NO";
        
    }
    return 0;
}