#include<stdio.h> int isPalindrome(int x){ if(x<0){ return 0; } int div=1; while(x / div>=10){ div*=10; } while(x>0){ int left = x / div; int right = x % 10; if(left != right){ return 0; } x = (x % div)/10; div /= 100; } return 1; }

int main() { int x; scanf("%d",&x); if(isPalindrome(x)){ printf("yes"); }else{ printf("no"); }

return 0;

}