function solve(obj) {
	let temp = { ...obj };
	const res = {};
	Object.entries(temp).forEach(([key, val]) => {
		if (res[val] === undefined) res[val] = key;
		else if (Array.isArray(res[val])) res[val].push(key);
		else res[val] = [res[val], key];
	});
	return res;
}