function Main(input) {
	const [s, t] = input.split('\n').map(x => x.trim());
	const all = ['beachball', 'shrinebell', 'watermelon'];
	const result = all.find(x => x !== s && x !== t);
	console.log(result);
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));