#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;
using ll = long long;

int main() {
    int n = 3;
    int r = 0;
    for (int i = 0; i < n; i++) {
        int a, b;
        cin >> a >> b;
        r += a;
        r %= 2;
    }

    cout << (r == 0 ? ":-)" : ":-(") << endl;

    return 0;
}