#include<bits/stdc++.h> using namespace std; int main() { string a; int max,cnt=0; cin>>a; int i = 0; while(a[cnt]!='\0') { cnt++; } while(a[i]!='\0') { if(a[i]!=a[cnt-1-i]) { cout<<"No"; return 0; } if(i>cnt/2){ break; } i++; } cout<<"Yes"; }