#35845: __紀錄
chrisccc1224@gmail.com
(aaaaaa)
#include<iostream>
#include<string>
using namespace std;
int main()
{
string a;
getline(cin, a);
int num = a.length() - 1;
int i;
for (i = 0; i <= num / 2; i++)
{
if (a[i] != a[num - i])
{
cout << "no";
break;
}
else if (i == num / 2 )
{
cout << "yes";
}
else
continue;
}
return 0;
}