#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() using namespace std; int main(){ int n,r,t; cin>>n; while(t!=0){ r=r*10+t%10; t/=10; } if(r==n){ cout<<"YES"; } else{ cout<<"NO";} return 0; }