#include<iostream> #include<cstring> using namespace std; int main() { char s[100]; int len; int i,j; gets(s); len = strlen(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; }