#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 a,x,y=0; cin>>x; a=x; while(x!=0){ y=y*10+x%10; x/=10; } if(a==y){ cout<<"YES"; } else{ cout<<"NO"; } return 0; }