#include<iostream> #include<cstring> #include<string> #include<cstdio> using namespace std; int main() { char s[100]; int len,position; int i,j; gets(s); i=0; j=len-1; while((i<j)&&s[i]==s[j]){ i++; j--; } if(i>=j){ cout<<"yes"<<endl; } else cout<<"no"<<endl; return 0; }