#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() #include<bits/stdc++.h> using namespace std; int main() { int n,m=0,n1; cin>>n; while(n!=0){ m=m*10+n1/10; n/=10; } if(m==n){ cout<<"NO"; } else{ cout<<"YES"; } return 0; }