#include<iostream>
#include<string>
#include<cctype>
using namespace std;
int main()
{
    string s,r ="",cleaned="";
    getline(cin,s);
    
    for(char c:s)
    if(isalnum(c))
    cleaned+=tolower(c);
    for(char c:cleaned)
    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<<"No";
        return 0;
    }
    cout<<"Yes";
}