#include<bits/stdc++.h> using namespace std; int main() { char s[1000]; int s1; cin>>s; s1=strlen(s); for(int i=0; i<=s1/2; i++) { if(s[i] != s[s1-1-i]){ cout<<"No"; //黑鲨 return 0; } } cout<<"Yes"; return 0; }