import std;

void main () {
    string S = readln.chomp;
    string T = readln.chomp;
    bool[string] mp;
    mp["watermelon"] = true;
    mp["beachball"] = true;
    mp["shrinebell"] = true;

    mp.remove(S);
    mp.remove(T);

    foreach (key, val; mp) writeln(key);
}

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