#include using namespace std; using ll=long long; using pll=pair; using tll=tuple; using ld=long double; const ll INF=(1ll<<60); #define rep(i,n) for(ll i=0;i<(ll)(n);i++) #define all(v) v.begin(),v.end() template void chmin(T &a,T b){ if(a>b){ a=b; } } template void chmax(T &a,T b){ if(a st={"watermelon","beachball","shrinebell"}; string s,t; cin >> s >> t; st.erase(s); st.erase(t); cout << *begin(st) << '\n'; }