#include<iostream>
#include<string>
using namespace std;
int main()
{
    string s,r ="";
    getline(cin,s);
    
    for(char c:s)
    if(r.find(C)==string::npos)
    r+=c;
    for(int i=0;i<r.length()/2;i++)
    if(r[i]!=r[r.length()-1-i])
    {
        cout<<"not";
        return 0;
    }
    cout<<"Yes"
    
}