#include<stdio.h> bool hws(long int x) {

long int s, y=0;
s=x;
while(s>0)
{
	y=y*10+s%10;
	s=s/10;
	
}
if(y==x)
return true;
else
return false;

} int main(){ long int n; scanf("%ld",&n); bool flag = hws(n); if(flag==0){ printf("no");}else{ printf("yes");} return 0;

}