import std;

void main () {
    int N = readln.chomp.to!int;
    if (N < 1200) {
        writeln("green");
    }
    else {
        writeln("difficult");
    }
}

void read (T...) (string S, ref T args) {
    auto buf = S.split;
    foreach (i, ref arg; args) {
        arg = buf[i].to!(typeof(arg));
    }
}