#include <iostream>
using namespace std;
int main() {
	int a[3], b[3];
	bool o = false;
	for (int i = 0; i < 3; i++) {
		cin >> a[i] >> b[i];
		o ^= a[i] & 1;
	}
	cout << (o ? ":-(" : ":-)") << endl;
	return 0;
}