#include <bits/stdc++.h>
using namespace std;

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