#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
int main() {
vector <int> f;
vector <int> k;
int a, b;
cin >> a >> b;
f.push_back(a);
f.push_back(b);
k.push_back(b);
k.push_back(a);
reverse(f.begin(), f.end());
if(f == k)cout << "rf";
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8c3RyaW5nPgojaW5jbHVkZSA8dmVjdG9yPgojaW5jbHVkZSA8YWxnb3JpdGhtPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKSB7Cgl2ZWN0b3IgPGludD4gZjsKCXZlY3RvciA8aW50PiBrOwoJaW50IGEsIGI7CgljaW4gPj4gYSA+PiBiOwoJZi5wdXNoX2JhY2soYSk7CglmLnB1c2hfYmFjayhiKTsKCWsucHVzaF9iYWNrKGIpOwoJay5wdXNoX2JhY2soYSk7CglyZXZlcnNlKGYuYmVnaW4oKSwgZi5lbmQoKSk7CglpZihmID09IGspY291dCA8PCAicmYiOwoJcmV0dXJuIDA7Cn0=