#include<iostream> #include<cmath> using namespace std; char a[100001]; int main(){ cin>>a; int n = 0; for(int i = 0;a[i] != '\0';i++){ n++; } int i = 0,j = n-1; while(i<j){ if(a[i] != a[j]){ cout<<"No"; return 0; } i++; j--; } cout<<"Yes"; return 0; }