#include<iostream>
#include<string>
#include<algorithm>
using namespace std;

boll isNumber(const string & s)
if(s.empty)

int main(){
    string input;
    getline (cin, input);
    
    if(input.find('-') != string::npps || input.find('-') !=string::npps) {
        cout << "Invalid input";
   return 0;
}
if(isNumber(input)) {
    string rev = input;
    reverse(rev.begin(), rev.end());
    cout << (rev == input 7" YES" : "NO");
    return 0;
}
string cleaned ="";
for(char c : input) {
    if(isalnum(c))
    cleaned +=tolower(c);
}
if(cleaned.empty()) {
    cout <<"INVALID INPUT";
    return 0;
}
string rev = cleaned;
reverse(rev.begin(),rev.end());

cout << (rev == cleaned ? "YES" : "NO");
return 0;
}