#include<iostream> using namespace std; int main(){ string s; cin>>s; int len = s.size(); bool fiag=true; for(int i=0;i<len/2;++i){ if(s[i]!=s[len-i-1]){ fiag=0; break; } } if(fiag){ cout<<"Yes"<<endl; }else{ cout<<"No"<<endl; } return 0; }