include

using namespace std; int main() { string s; getline(cin, s); int len; len = s.length(); int a = 0; for (int i = 0,j=len-1; i < len/2 ; i++,j—) { if (s[i] == s[j]) {

        a = a + 0;
    }
    else {
        a=a+1;
        break;
    }
}
if (a <= 1) {
    cout << "yes";
}
else{
    cout << "no";
}
return 0;

}