#include <bits/stdc++.h>
using namespace std;
string Palindrome(string str)
{
string P=str;
reverse(P.begin(),P.end());
if(str==P)
{
return "Yess";
}
else
{
return "NOO";
}
}
int main()
{
string str;
cin>>str;
cout<<Palindrome(str);
return 0;
}
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