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

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