#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <math.h>
#include <iomanip>

using namespace std;

int main(){
	int a,b,c,d,e,f;
	cin >> a >> b >> c >> d >> e >> f;
	int ans=a+c+e;
	if(ans%2==0){
		cout << ":-)" << endl;
	}else{
		cout << ":-(" << endl;
	}
	return 0;
}